This problem is not unique and I described it in another topic:
Hello! In the admin panel after update the module to version 4.6.2 incorrect page is displayed module. In the error console of the browser Google shows the following:
Uncaught ReferenceError: writeDynaList is not defined index.php:401
http://mysite/administrator/index.php?option=com_modules&view=module&layout=edit&id=379 Failed to load resource: the server responded with a status of 500 (Internal Server Error)
Prompt - what's the problem?!
When you enable debug component in JOOMLA appeared the following: