Antlr4（CSharp目标），语法= Java.g4：生成的JavaLexer.cs不编译

I am using Antlr4cs-4.3.0 with Visual Studio 2012, .Net 4.5. I have successfully generated and exercised a parser produced from a simple grammar (calculator.g4) and thus feel that I have things properly setup in Visual Studio. I am now attempting to generate a parser for the Java.g4 grammar which I obtained from I am using Antlr4cs-4.3.0 with Visual Studio 20