antlr can't process PS.g4 java.lang.NullPointerException: Cannot read field "tool" because "g" is null at org.antlr.v4.codegen.CodeGenerator.create(CodeGenerator.java ...

Getting the following error, which I cannot seem to replicate on vanilla VoxelMap: [02:42:13] [Voxelmap WorldMap Calculation Thread 2/ERROR]: Uncaught exception in thread "Voxelmap WorldMap ...

ERROR: NullPointerException encountered while trying to adding String to Deque that is set to null. java.lang.NullPointerException INFO: Successful at adding String to Deque that is set to null ...

Then there’s the NullPointerException. Null pointer exception is an “exception” (error) that is particularly common when programming in Java.