Backup failure - tape device error

The consistency check of the snapshot for the Microsoft Exchange database Database was successful.
Storage device "IBM 1" reported an error on a request to write data to media.
Error reported:
A device attached to the system is not functioning.
V-79-57344-34036 - An unknown error has occurred.

After this, the next two jobs run OK, but to another tape in the library.  This job's tape has an unreadable end-marker.  I asked my onsite contact how old the cleaning tape was, and he didn't know so we are getting him a new one asap.  Hopefully that does it. 

relevant bengine log snippet. 

[3076] 09/21/15 23:34:59 TF_NDMPStartWrite(): Started MediaServerWriteThread 4680
[1840] 09/21/15 23:36:18 DeviceManager: timeout event fired
[1840] 09/21/15 23:36:18 DeviceManager: processing pending requests
[1840] 09/21/15 23:36:18 DeviceManager: going to sleep for 900000 msecs
[1840] 09/21/15 23:51:18 DeviceManager: timeout event fired
[1840] 09/21/15 23:51:18 DeviceManager: processing pending requests
[1840] 09/21/15 23:51:18 DeviceManager: going to sleep for 900000 msecs
[4680] 09/21/15 23:54:48 ProcessMoverError default case!  mvrRet = 0x0000001f.  Returning 0xe00084f4.
[3076] 09/21/15 23:54:49 TF_NDMPGetResult(): MediaServer thread done, returning TFLE 0xE00084F4
[3076] 09/21/15 23:54:49 BaseBSDProcessor::MessagePumpAndWaitForResults(): TF_NDMPGetResult() returned 0xE00084F4
[3076] 09/21/15 23:54:49 TF_FreeTapeBuffers: from 0 to 0 buffers
[3076] 09/21/15 23:54:49  data halted: SUCCESSFUL
[3076] 09/21/15 23:54:49 BaseBSDProcessor::PollDataServer: Shutting down.
[3076] 09/21/15 23:54:49 RABackupBSDProcessor: MessagePumpAndWiatForResults() returned -536836876 (0xe00084f4)
[3076] 09/21/15 23:54:49 ERROR: 13 Error: Invalid state to process request
[3076] 09/21/15 23:54:49 BackupMessageHandler::CDB_EndCurrentCatalogOperation(  ) -- entered
[3076] 09/21/15 23:54:49 BackupMessageHandler::CDB_EndCurrentCatalogOperation(  ) is calling PerBSDDataVector[engine_id]->EndCatOperation( )
[3076] 09/21/15 23:54:49 EndCatOperation succeeded
[3076] 09/21/15 23:54:49 BackupMessageHandler::CDB_EndCurrentCatalogOperation(  ) -- returning
[3076] 09/21/15 23:54:49 BackupMessageHandlerForBackupJob::process( eng_msgs::close_catalog & msg ) called
[3076] 09/21/15 23:54:49 Not: 'm_bCatalogDrivenBackup && CatBuildVector[engine_id] && GetCarryFwdCatalogInfoForRemainingObjs( )'
[3076] 09/21/15 23:54:49 ERROR: CatBuildVector[engine_id] is NULL!!!!!
[3076] 09/21/15 23:54:49 TF_FreeTapeBuffers: from 0 to 0 buffers
[3076] 09/21/15 23:54:49 TF_CloseSet
[3076] 09/21/15 23:54:49 Error detected
[3076] 09/21/15 23:54:49 FreeFormatEnv( cur_fmt=0 )
[3076] 09/21/15 23:54:49 PDI backup - done. result = e00084f4
[3076] 09/21/15 23:54:49 Enter NDMPSnapHostBackupEngine::TrackSnappedBSD
[3076] 09/21/15 23:54:55 Exit NDMPSnapHostBackupEngine::TrackSnappedBSD
[3076] 09/21/15 23:54:55 NDMPSnapHostBackupEngine::ProcessBSDs Top of the loop
[3076] 09/21/15 23:54:55 snapResult = 0x0, result = 0xe00084f4
[3076] 09/21/15 23:54:55 NDMPSnapHostBackupEngine::ProcessBSDs Top of the loop
[3076] 09/21/15 23:54:55 snapResult = 0x0, result = 0xe00084f4
[3076] 09/21/15 23:54:55 Exit NDMPSnapHostBackupEngine::ProcessBSDs
[3076] 09/21/15 23:54:55 @@@@@@@MyCloseSocket called with sockfd = 1904(0x770)    retval = 0
[3076] 09/21/15 23:54:55 NDMPAgentConnector::EndConnection(): Data Server = LIEX-MAIL
[3076] 09/21/15 23:54:55 Setting rewind flag to true for older device.  This will likely degrade the performance of the current job.