An update conflict has occurred, and you must re-try this action. The object … is being updated by …, in the … process, on machine ….

An update conflict has occurred, and you must re-try this action.
The object … is being updated by …, in the … process, on machine ….

To resolve this issue, clear the file system cache on all servers in the server farm. To do this, follow these steps:

http://support.microsoft.com/kb/939308/en-us