One or more of the required vApps could not be retreived.
Not all of the vApps that were required by the given specification could be retreived. This can be caused by a change in the vCD vApps definition or a user mistake in the provided vApp spec.
The operation will proceed, as there are still existing items to operate on.
Check the provided vApps specification to make sure the specification matches the existing configuration. Correct any issues and try the operation again.