New to modding, Minecraft crashes when launched

[skrags]

I know the title is similar to a previous post by VeteranWarrior, but this is different

 

I think

 

Anyway, in eclipse i try to run 1.12 with some small tweaks I made because I'm still pretty new to modding and java, and it starts loading and I can see java opening, but in the console it says that all (or almost all) the sound files are missing, and then java crashes with red text in the console saying:

AL lib: (EE) alc_cleanup: 1 device not closed

 

I'm also using java 1.8, does anybody know how to fix it?