mybatis-plus 错误java.lang.NoClassDefFoundError: org/apache/velocity/context/Context

错误

使用mybatis-plus自动生成文件的时候，报下面的错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/velocity/context/Context
    at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:100)
    at com.layuicms.erp.utils.CodeGenerator.main(CodeGenerator.java:101)
Caused by: java.lang.ClassNotFoundException: org.apache.velocity.context.Context
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more

Process finished with exit code 1Exception