I have a problem with the installation of Concrete5 5.7.4RC1. Our host environment for developing uses Apache 2.4 with dynamic host configuration. The structure of a URL is "sub-projekt.branch.developer-pc.dev".
When installed Concrete5 5.7.4RC1 into "cms.trunk_storm.it-15.dev" the following php exception is thrown:
[Tue Apr 21 11:13:33.935379 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of Require all granted: granted
[Tue Apr 21 11:13:33.935425 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of <RequireAny>: granted
[Tue Apr 21 11:13:33.935581 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of Require all granted: granted
[Tue Apr 21 11:13:33.935601 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of <RequireAny>: granted
[Tue Apr 21 11:13:33.963932 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP Fatal error: Uncaught exception 'Whoops\\Exception\\ErrorException' with message 'Argument 1 passed to Concrete\\Core\\Asset\\AssetGroup::addGroup() must be an instance of Concrete\\Core\\Asset\\AssetGroup, null given, called in /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php on line 183 and defined' in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php:33\nStack trace:\n#0 /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php(33): Whoops\\Run->handleError(4096, 'Argument 1 pass...', '/var/www/trunk_...', 33, Array)\n#1 /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php(183): Concrete\\Core\\Asset\\AssetGroup->addGroup(NULL)\n#2 /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php(75): Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset('core/app', false)\n#3 /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php(8): Concrete\\Core\\View\\AbstractView->requireAsset('core/app')\n#4 /var/www/trunk in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php on line 33
[Tue Apr 21 11:13:33.964765 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP Catchable fatal error: Argument 1 passed to Concrete\\Core\\Asset\\AssetGroup::addGroup() must be an instance of Concrete\\Core\\Asset\\AssetGroup, null given, called in /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php on line 183 and defined in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php on line 33
[Tue Apr 21 11:13:33.964783 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP Stack trace:
[Tue Apr 21 11:13:33.964796 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 1. Whoops\\Run->handleShutdown() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:0
[Tue Apr 21 11:13:33.964807 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 2. Whoops\\Run->handleError() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:339
[Tue Apr 21 11:13:33.964817 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 3. Whoops\\Run->handleException() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:315
[Tue Apr 21 11:13:33.964826 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 4. Concrete\\Core\\Error\\Handler\\ErrorHandler->handle() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:248
[Tue Apr 21 11:13:33.964851 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 5. Concrete\\Core\\Application\\Service\\UserInterface->renderError() /var/www/trunk_storm/instances/concrete5/concrete/src/Error/Handler/ErrorHandler.php:39
[Tue Apr 21 11:13:33.964861 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 6. Concrete\\Core\\View\\AbstractView->render() /var/www/trunk_storm/instances/concrete5/concrete/src/Application/Service/UserInterface.php:320
[Tue Apr 21 11:13:33.964870 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 7. Concrete\\Core\\View\\View->renderViewContents() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:123
[Tue Apr 21 11:13:33.964878 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 8. include() /var/www/trunk_storm/instances/concrete5/concrete/src/View/View.php:189
[Tue Apr 21 11:13:33.935379 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of Require all granted: granted
[Tue Apr 21 11:13:33.935425 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of <RequireAny>: granted
[Tue Apr 21 11:13:33.935581 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of Require all granted: granted
[Tue Apr 21 11:13:33.935601 2015] [authz_core:debug] [pid 16174] mod_authz_core.c(802): [client 127.0.0.1:55804] AH01626: authorization result of <RequireAny>: granted
[Tue Apr 21 11:13:33.963932 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP Fatal error: Uncaught exception 'Whoops\\Exception\\ErrorException' with message 'Argument 1 passed to Concrete\\Core\\Asset\\AssetGroup::addGroup() must be an instance of Concrete\\Core\\Asset\\AssetGroup, null given, called in /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php on line 183 and defined' in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php:33\nStack trace:\n#0 /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php(33): Whoops\\Run->handleError(4096, 'Argument 1 pass...', '/var/www/trunk_...', 33, Array)\n#1 /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php(183): Concrete\\Core\\Asset\\AssetGroup->addGroup(NULL)\n#2 /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php(75): Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset('core/app', false)\n#3 /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php(8): Concrete\\Core\\View\\AbstractView->requireAsset('core/app')\n#4 /var/www/trunk in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php on line 33
[Tue Apr 21 11:13:33.964765 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP Catchable fatal error: Argument 1 passed to Concrete\\Core\\Asset\\AssetGroup::addGroup() must be an instance of Concrete\\Core\\Asset\\AssetGroup, null given, called in /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php on line 183 and defined in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php on line 33
[Tue Apr 21 11:13:33.964783 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP Stack trace:
[Tue Apr 21 11:13:33.964796 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 1. Whoops\\Run->handleShutdown() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:0
[Tue Apr 21 11:13:33.964807 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 2. Whoops\\Run->handleError() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:339
[Tue Apr 21 11:13:33.964817 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 3. Whoops\\Run->handleException() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:315
[Tue Apr 21 11:13:33.964826 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 4. Concrete\\Core\\Error\\Handler\\ErrorHandler->handle() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:248
[Tue Apr 21 11:13:33.964851 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 5. Concrete\\Core\\Application\\Service\\UserInterface->renderError() /var/www/trunk_storm/instances/concrete5/concrete/src/Error/Handler/ErrorHandler.php:39
[Tue Apr 21 11:13:33.964861 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 6. Concrete\\Core\\View\\AbstractView->render() /var/www/trunk_storm/instances/concrete5/concrete/src/Application/Service/UserInterface.php:320
[Tue Apr 21 11:13:33.964870 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 7. Concrete\\Core\\View\\View->renderViewContents() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:123
[Tue Apr 21 11:13:33.964878 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 8. include() /var/www/trunk_storm/instances/concrete5/concrete/src/View/View.php:189
[Tue Apr 21 11:13:33.964886 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 9. Concrete\\Core\\View\\AbstractView->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php:8
[Tue Apr 21 11:13:33.964895 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 10. Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:75
[Tue Apr 21 11:13:33.964903 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 11. Concrete\\Core\\Asset\\AssetGroup->addGroup() /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php:183
[Tue Apr 21 11:13:33.964910 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 12. Whoops\\Run->handleError() /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php:33
[Tue Apr 21 11:13:33.964918 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 13. Whoops\\Run->handleException() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:315
[Tue Apr 21 11:13:33.964926 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 14. Concrete\\Core\\Error\\Handler\\ErrorHandler->handle() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:248
[Tue Apr 21 11:13:33.964934 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 15. Concrete\\Core\\Application\\Service\\UserInterface->renderError() /var/www/trunk_storm/instances/concrete5/concrete/src/Error/Handler/ErrorHandler.php:39
[Tue Apr 21 11:13:33.964942 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 16. Concrete\\Core\\View\\AbstractView->render() /var/www/trunk_storm/instances/concrete5/concrete/src/Application/Service/UserInterface.php:320
[Tue Apr 21 11:13:33.964950 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 17. Concrete\\Core\\View\\View->renderViewContents() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:123
[Tue Apr 21 11:13:33.964958 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 18. include() /var/www/trunk_storm/instances/concrete5/concrete/src/View/View.php:189
[Tue Apr 21 11:13:33.964965 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 19. Concrete\\Core\\View\\AbstractView->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php:8
[Tue Apr 21 11:13:33.964973 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 20. Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:75
[Tue Apr 21 11:13:33.964981 2015] [:error] [pid 16174] [client 127.0.0.1:55804] PHP 21. Concrete\\Core\\Asset\\AssetGroup->addGroup() /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php:183
[Tue Apr 21 11:13:34.938337 2015] [authz_core:debug] [pid 16170] mod_authz_core.c(802): [client 127.0.0.1:55805] AH01626: authorization result of Require all granted: granted, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.938384 2015] [authz_core:debug] [pid 16170] mod_authz_core.c(802): [client 127.0.0.1:55805] AH01626: authorization result of <RequireAny>: granted, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.938464 2015] [authz_core:debug] [pid 16170] mod_authz_core.c(802): [client 127.0.0.1:55805] AH01626: authorization result of Require all granted: granted, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.938473 2015] [authz_core:debug] [pid 16170] mod_authz_core.c(802): [client 127.0.0.1:55805] AH01626: authorization result of <RequireAny>: granted, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.962237 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP Fatal error: Uncaught exception 'Whoops\\Exception\\ErrorException' with message 'Argument 1 passed to Concrete\\Core\\Asset\\AssetGroup::addGroup() must be an instance of Concrete\\Core\\Asset\\AssetGroup, null given, called in /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php on line 183 and defined' in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php:33\nStack trace:\n#0 /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php(33): Whoops\\Run->handleError(4096, 'Argument 1 pass...', '/var/www/trunk_...', 33, Array)\n#1 /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php(183): Concrete\\Core\\Asset\\AssetGroup->addGroup(NULL)\n#2 /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php(75): Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset('core/app', false)\n#3 /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php(8): Concrete\\Core\\View\\AbstractView->requireAsset('core/app')\n#4 /var/www/trunk in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php on line 33, referer:http://cms.trunk_storm.it-15.dev/index.php/install...
[Tue Apr 21 11:13:34.963063 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP Catchable fatal error: Argument 1 passed to Concrete\\Core\\Asset\\AssetGroup::addGroup() must be an instance of Concrete\\Core\\Asset\\AssetGroup, null given, called in /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php on line 183 and defined in /var/www/trunk_storm/instances/concrete5/concrete/src/Asset/AssetGroup.php on line 33, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963081 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP Stack trace:, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963094 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 1. Whoops\\Run->handleShutdown() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:0, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963105 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 2. Whoops\\Run->handleError() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:339, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963115 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 3. Whoops\\Run->handleException() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:315, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963125 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 4. Concrete\\Core\\Error\\Handler\\ErrorHandler->handle() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:248, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963134 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 5. Concrete\\Core\\Application\\Service\\UserInterface->renderError() /var/www/trunk_storm/instances/concrete5/concrete/src/Error/Handler/ErrorHandler.php:39, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963160 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 6. Concrete\\Core\\View\\AbstractView->render() /var/www/trunk_storm/instances/concrete5/concrete/src/Application/Service/UserInterface.php:320, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963170 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 7. Concrete\\Core\\View\\View->renderViewContents() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:123, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963178 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 8. include() /var/www/trunk_storm/instances/concrete5/concrete/src/View/View.php:189, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963187 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 9. Concrete\\Core\\View\\AbstractView->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php:8, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963196 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 10. Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:75, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963205 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 11. Concrete\\Core\\Asset\\AssetGroup->addGroup() /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php:183, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963213 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 12. Whoops\\Run->handleError() /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php:33, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963222 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 13. Whoops\\Run->handleException() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:315, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963230 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 14. Concrete\\Core\\Error\\Handler\\ErrorHandler->handle() /var/www/trunk_storm/instances/concrete5/concrete/vendor/filp/whoops/src/Whoops/Run.php:248, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963239 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 15. Concrete\\Core\\Application\\Service\\UserInterface->renderError() /var/www/trunk_storm/instances/concrete5/concrete/src/Error/Handler/ErrorHandler.php:39, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963247 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 16. Concrete\\Core\\View\\AbstractView->render() /var/www/trunk_storm/instances/concrete5/concrete/src/Application/Service/UserInterface.php:320, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963256 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 17. Concrete\\Core\\View\\View->renderViewContents() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:123, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963263 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 18. include() /var/www/trunk_storm/instances/concrete5/concrete/src/View/View.php:189, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963272 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 19. Concrete\\Core\\View\\AbstractView->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/themes/core/error.php:8, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963280 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 20. Concrete\\Core\\Http\\ResponseAssetGroup->requireAsset() /var/www/trunk_storm/instances/concrete5/concrete/src/View/AbstractView.php:75, referer: http://cms.trunk_storm.it-15.dev/index.php/install
[Tue Apr 21 11:13:34.963294 2015] [:error] [pid 16170] [client 127.0.0.1:55805] PHP 21. Concrete\\Core\\Asset\\AssetGroup->addGroup() /var/www/trunk_storm/instances/concrete5/concrete/src/Http/ResponseAssetGroup.php:183, referer: http://cms.trunk_storm.it-15.dev/index.php/install
Changing the host configuration to "cms.it-15.dev" (one "subdomain" fewer) all works perfectly.
I worked out that it's the underscore in the URL.
There is a library in concrete5 now that checks for valid domains, with an underscore actually being invalid I believe. It worked in earlier versions as it wasn't being enforced and some servers will still work with an underscore. (I think that's the case at least)
I do think the error message needs to be better though, it should throw some sort of exception that relates to the problem, not this exception from a knock-on effect.
The moral of the story is that domains need to be valid.