All of sudden, one of my wordpress sites breaks and outputs this when I go in to add/edit a post
Error 500 - Internal server error An internal server error has occured! Please try again later.
What can I do?
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This Kind of problem is something you need to check step by step..
If you change the name of your plugin directory and that solves the problem you can now go plugin by plugin activating / deActivating them to check which one is the problem.
As a last resort
Hope this helps :)