The issue is caused by MC not loading with GT6’s AT’s, so… really curious how that library was linked in?!? Gradle’s dependency management will do it fine (have to run setup workspace again of course to update the mappings), or loading it via the normal Forge modloader should work too (but that’s runtime only, no compiling to it), but just linking it in at load time (like putting it in a libs directory or something wrong like that) may not work unless you manually specify the AT things to load via the FML launch command line arguments.
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