Failded to get the activities of BuildRequest

I got the follow error when I refresh Activities View.The BuildRequest ID:80 is a request of deleted track.Since I have deleted that track in CMS,why it's build request is still in use.Follow shows the error:

Failded to get the activities of BuildRequest.(BuildRequest ID:80)

Get Request Activities finished with:CBS Server Error:The request is not known(internal code:REQ_UNKNOWN)