
To filter the events so that only events with a Source of VSS are shown, in the Actions pane, click Filter Current Log.In Event Viewer, expand Windows Logs, and then click Application.If the User Account Control dialog box appears, ensure that the action it displays is what you want, and then click Continue
Click Start, click Run, type eventvwr.msc, and then click OK. To open Event Viewer and view events related to VSS requester applications: Open Event Viewer and view events related to VSS requester applications To perform these procedures, you must have membership in Administrators, or you must have been delegated the appropriate authority. Also, you should check that the VSS service is enabled. To troubleshoot this error condition, you need to determine what caused it by using the Event Viewer and then contact the vendor that created the Vdata protection application that uses VSS. This event indicates that an unexpected Volume Shadow Copy Service (VSS) error has occurred. How To Resolve First determine the cause of the error condition and then contact the appropriate vendor
Volume Shadow Copy Service error: Unexpected error calling routine %1.