Ilyat

So what should I do to use mod from local jar? I try this: runtimeOnly fg.deobf(files("libs/mu_jar.jar")) but it has no effect.

I want to have some mods added to minecraft while I'm developing mods (not to interract with their api, just to have them installed in my development client). So I just place them in "mods" folder of my "run" directory. Some mods load perfectly, but some of them throw exceptions and crash the game. The interesting part is that in normal minecraft with same forge version and same mods they work absolutely fine! How is it possible and how to fix it? And what is the difference between forge used for development and forge used in normal minecraft? I thought there is none, but those crashes puzzle me.