Hello, I have been getting the following internal error from ANTLR/ANTLRWorks (v.1.0.2) when checking my grammar (or when generating code): error(10): internal error: org.antlr.tool.Grammar.createLookaheadDFA(Unknown Source): could not even do k=1 for decision 5 What does the above message mean? Also, which one is decision 5? Thanks, Robby