Uh what GregTech is that? This clearly is not GregTech 6. And it is also not any GregTech that I have made, because I never used that “com.google.common.base.CaseFormat.to” thing in my code.
You might need to Report that to the GregTech-5-Port Author that your GregTech came from, because I have no Idea what this even could be.