Java.lang.illegalaccesserror Minecraft

when trying to create a new world minecraft writes "saving world" and crashes (1.21.1 build 210)

java.lang.IllegalAccessError: class rbasamoyai.createbigcannons.cannon_control.config.SimpleBlockMountProperties$Serializer tried ...

java.lang.IllegalAccessError: class rbasamoyai.createbigcannons.cannon_control.config.SimpleBlockMountProperties$Serializer tried ...

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