在 Antlr4 中找不到符号

Question

这是我的语法文件，这是我的 SimpleBaseListner.java 文件// Generated from Simple.g4 by ANTLR 4.7.1import org.antlr.v4.runtime.tree.ParseTreeListener;/** * This interface defines a complete listener for a parse tree produced by * {@link SimpleParser}. */public interface SimpleListener extends ParseTreeListener {/** * Enter a parse tree produced by {@link SimpleParser#file}. * @param ctx the parse tree */void enterFile(SimpleParser.FileContext ctx);/** * Exit a parse tree produced by {@link SimpleParser#file}. * @param ctx the parse tree */void exitFile(SimpleParser.FileContext ctx);/** * Enter a parse tree produced by {@link SimpleParser#func}. * @param ctx the parse tree */void enterFunc(SimpleParser.FuncContext ctx);/** * Exit a parse tree produced by {@link SimpleParser#func}. * @param ctx the parse tree */void exitFunc(SimpleParser.FuncContext ctx);/** * Enter a parse tree produced by {@link SimpleParser#arg}. * @param ctx the parse tree */void enterArg(SimpleParser.ArgContext ctx);/** * Exit a parse tree produced by {@link SimpleParser#arg}. * @param ctx the parse tree */void exitArg(SimpleParser.ArgContext ctx);/** * Enter a parse tree produced by {@link SimpleParser#body}. * @param ctx the parse tree */void enterBody(SimpleParser.BodyContext ctx);/** * Exit a parse tree produced by {@link SimpleParser#body}. * @param ctx the parse tree */当我使用编译它时javac SimpleBaseListner.java，出现以下我是 Antlr4 的新手，我不知道这里出了什么问题。虽然是说找不到符号，但是这个类型的Scope是在语法文件中定义的。因此，据我所知，它应该在 Antlr4 编译语法文件时定义。有人能帮我吗？