Topic category: Troubleshooting, bugs, and solutions
I was making my 1.12.2 mod using generetor with the version 2020.5
Then, an error appeared with the code of 400.
Then I changed the version to 1.15.2 (deafult version supported). It worked fine.
So, mcreator broke when I change version to 1.12.2 and It was working fine before.