how to set error message of clang::tooling::CommonOptionsParser

...
  clang::tooling::CommonOptionsParser OptionsParser(argc, arg_list, my_tool_category);
  ClangTool Tool(OptionsParser.getCompilations(),
                 GetFiles(OptionsParser.getSourcePathList()));
...

If I don’t enter a positional parameter, an error will be output:

 user umlgen % ./build/bin/umlgen 
    LLVM ERROR: CommonOptionsParser: failed to parse command-line arguments. [CommonOptionsParser]: umlgen: Not enough positional command line arguments specified!
    Must specify at least 1 positional argument: See: ./build/bin/umlgen --help
    
    [1]    28231 abort      ./build/bin/umlgen

I want to set this error message, is there a way?