If the repository holding the file referenced in a Download instruction is deleted or has its visibility permissions changed during the download, this error will be generated. Note that the existence of the repository is checked just before the deployment is started, so something must have changed after that point for this error message to appear.

Check to make sure that the repository still exists and still has the proper permissions set. Also be sure that the user context used by the agent/Connector is able to access the repository - either explicitly or as a member of an organization that can