Yeah, i tried to fix that exception and didn’t give enough attention to code architecture. I’ll refactor when it will work. It is a totally different than 1.12.2 modding so there is not too much new modes or information about new versions. Thanks.
I doubt that it is caused by the government's firewall, as I am currently in China, and I can still build/setup projects without major connection problem (although relatively slow due to the geographical location).