Obfuscation Error, NoSuchMethodException: Integer.intValue(java.lang.Integer)

[FirephoenixX02]

Bug Report

Expected Behaviour

Jar runs without issues

Actual Behaviour

Error: https://pastes.dev/OhqNExPZUx

How to reproduce the behaviour

Obfuscation issue. Config: https://pastes.dev/l2nKwpWzry (To get the config open the obfuscator in GUI-Mode, goto Config, enable PrettyPrint and press Build)

Possible fix

idk