Ever since I've updated to 1.10 the modpack fails to load. I've deleted the modpack and redownloaded it and it does the same thing. p455w0rdslib keeps crashing it. And I've tried different versions of the library.

The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from p455w0rd's Library (p455w0rdslib)

Likely experiencing the same issue. Full crash log is here pastebin here Running from the MultiMC launcher.

PWLib is rolled back to dec 2018 version