Eclipse运行时出现Error installing suite (39): The JAD matches a version of a suite al

Eclipse运行时出现
  ** Error installing suite (39):   The JAD matches a version of a suite already installed.
  Execution completed.
  是什么意思?如何解决呀!

------解决方法--------------------------------------------------------
我碰到过,换一个工作空间,在把原来的项目导进去就好了