如果您正在使用没有maven的项目，请确保您将jcommander.jar文件添加到类路径中。确保您的项目结构有一个TestNG库，其中只有一个testng.jar文件。

Make sure you added the jcommander.jar file to your classpath if you are using a project without maven. Make sure your project structure has a "TestNG" library that has only one testng.jar file inside it.