NetZCraft

This is just the console log. The debug.log is a file in the .minecraft\logs folder.

Oh yeah! Here's the new log. https://pastebin.com/q8wc2C5y

Post the debug.log.

Hmmm. I think it went a little bit further but still ended in the exit code 0.

yes, my modifier is there i have good news: my modifiers started working, the problem was my plant_fiber_from_grass.json was in the resources/data/primitivetools/ and not in the resources/data/primitivetools/loot_modifiers so it was just my carelessness   thanks you very much for the help!