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Without an instance you can't call instance methods.

https://mcforge.readthedocs.io/en/1.15.x/events/intro/

Read the documentation on the @EventBusSubscriber annotation again. There is something missing from your method signature.

The file specified will not exist on any website, it's a file that gets generated by ForgeGradle, have you changed your build.gradle?

Not sure what the problem is, I have no knowledge of OpenGL. However, try using an vanilla render type (like TRANSLUCENT_SHEET_LIT i think is one) and call the parent method in the renderParticle (don't draw anything with the buffer). It'll help you isolate your problem I think (and hope). Also, using vanilla's is a good idea, unless you want something complex, BasicParticleType and an existing IParticleRenderType will do the job.