I switched to a version that supports 1.21.1 of WeaponMechanics and I still get this error. Caused by: java.lang.reflect.InvocationTargetException at java.base/jdk ...
at appeng.core.sync.GuiBridge.ConstructGui(GuiBridge.java:471) ~[GuiBridge.class:?] at appeng.core.sync.GuiBridge.getClientGuiElement(GuiBridge.java:443) ~[GuiBridge ...