Then, uninstall UFMC anc 124thATCv2. Make up to 4 tests, depending in the results :
-None of them installed
-124thATCv2 installed alone
-UFMC installed alone
-both installed
Make sure you follow the installation instructions correctly.
Once the cause is identified, contact the respective developers with as many details as you can.
Good luck with that. The problem might come from third party plugins. Given the fact that you have many, it might be faster to start from a brand new install, indeed.