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java.lang.NullPointerException: 	at org.antlr.v4.runtime.tree.ParseTreeWalker.enterRule(ParseTreeWalker.java:64)	at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:49)	at c.CMain.lint_C(CMain.java:106)	at undefined.StyleMain.main(StyleMain.java:175)