TinyMCE fails to launch when editing a stack content block

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When attempting to edit a stack content block I get an empty window and the following error:

PHP Fatal error:  Call to a member function getThemeEditorCSS() on a non-object in /var/www/vhosts/www/concrete/blocks/content/editor_config.php on line 20, referer: http://myserver.com/index.php/dashboard/blocks/stacks/view_details/112/


Searching Google finds several other searchable error log files with the same error but a search through the C5 forums produced little help.

 
programmieraffe replied on at Permalink Reply
programmieraffe
Hey!

I had the same issue and the solution is the following:
Activate another theme. Afterwards you can activate your existing theme again. The issue is at least here solved than...

Filed a bug here:
http://www.concrete5.org/index.php?cID=330651...
CDMadmin replied on at Permalink Reply
I just had the same problem - solely the content blocks for Stacks were showing up blank when I went to the edit window. I tried your method of activating a different theme and it worked. Unfortunately I have a bunch of pages that use a different theme, so I have to go in and manually change those to the correct one. It started happening after I began "upgrading" themes and packages. I have no idea which one caused the problem though. I would have added a note in the bug section, but it says this problem has been "resolved" so it doesn't allow me to comment.