Set environment variable ANTLR_JAR to the file antlr-4.9.2-complete.jar in your computer Change current directory to initial/src where there is file run.py Type: python run.py gen Then type: python run.py test LexerSuite Then type: python run.py test ParserSuite Then type: python run.py test ASTGenSuite Then type: python run.py test CheckerSuite Then type: python run.py test CodeGenSuite