Following an upgrade to PHP5.3 by Network Solutions, I am no longer able to see any of the standard add-ons that came with my purchase of the ALPHA theme or any of the adds-on that I installed. When I hit the "ADD BLOCK" button in edit mode, I get the following error messages:

[Warning: require_once(/data/12/1/154/2/1154002/user/1226098/htdocs/concrete51/packages/image_slider/blocks/image_slider/controller.php) [function.require-once]: failed to open stream: No such file or directory in /data/12/1/154/2/1154002/user/1226098/htdocs/concrete51/concrete/core/libraries/loader.php on line 205]

[Fatal error: require_once() [function.require]: Failed opening required '/data/12/1/154/2/1154002/user/1226098/htdocs/concrete51/packages/image_slider/blocks/image_slider/controller.php' (include_path='/data/12/1/154/2/1154002/user/1226098/htdocs/concrete51/libraries/3rdparty:/data/12/1/154/2/1154002/user/1226098/htdocs/concrete51/concrete/libraries/3rdparty:.:/usr/share/php:/usr/services/vux/lib/php') in /data/12/1/154/2/1154002/user/1226098/htdocs/concrete51/concrete/core/libraries/loader.php on line 205]

Network Solutions thinks this is related to an incompatibility problem between the version of concrete5 that I am using and their recent PHP update. Can someone please help me to resolve this issue. I am using version 5.6.0.2 of concrete5.