在UCP中，Enroll Instance 时，出现Error
The collection sets on the specified instance of SQL Server must be stopped. Validation failed. The collection sets on the specified instance of SQL Server are not stopped. For more information, see the Help topic for this operation.
Scenarion 是：
Stop pre-existing collection sets on the specified instance of SQL Server. If the data collector is disabled, enable it, stop any running collection sets, then re-run validation rules for the Create UCP operation.
To enable the data collector:
In Object Explorer, expand the Management node.
Right-click Data Collection, and then click Enable Data Collection.
To stop a collection set:
In Object Explorer, expand the Management node, expand Data Collection, and then expand System Data Collection Sets.
Right-click the collection set that you want to stop, and then click Stop Data Collection Set.
A message box will display the result of this action, and a red circle on the icon for the collection set indicates that the collection set has stopped.
Enroll Instance 出现Collection Set 必须停止的 Error
原文：http://www.cnblogs.com/ljhdo/p/5174681.html