请教关于Quality Center Connection问题！

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请教关于Quality Center Connection问题！
请问连接时，为什么会报这个错？TestDirector和LoadRunner之间有什么关系？

Your connection to the TestDirector server failed.
You must install the latest TestDirector Connectivity Add-in.
To install, on the main TestDirector Login window, click the Add-in Page link. Then click the TestDirector Connectivity link. On the TestDirector Connectivity Add-in page, click the Download Add-in link to download the add-in.