500 internal server error when try to open wp-admin?

As a resource, I found this. Not sure if it’s the same issue.
https://ww.wp.xz.cn/support/topic/500-internal-server-error-wp-admin-only?replies=7

Not sure what you’re referring to by “nulled”, but a plugin conflict might do it. Easiest and simplest way to uninstall a plugin when your WordPress site breaks is to find that plugin’s folder and delete it out of the WordPress plugins folder. You can always reinstall them later.

I suggest removing them one by one so you can figure out which one caused the issue.

MM_CASETEST seems to be dreamweaver, but that’s just based off the below link
http://blog.timolthof.com/mm_casetest4291-dont-worry-its-dreamweaver/

Nice that you solved the problem, I’ve have the same problem so I wonder which plugin it was? 😉