Errors in VShadow.exe

Alright, all you Windows geeks: I need help. I tried to implement a backup script that uses a number of Microsoft tools. I keep getting errors that look like this:

ERROR: Selected writer 'ASR Writer' is in failed state!
- Status: 7 (VSS_WS_FAILED_AT_PREPARE_BACKUP)
- Writer Failure code: 0x800423f4 ()
- Writer ID: {be000cbe-11fe-4426-9c58-531aa6355fc4}
- Instance ID: {3700a103-e7f8-4008-80f0-bc91528ae80b}

None of this (the words, the error code, the status, etc) seems to show up much in Google, and I have no idea how to fix it. Does anyone have any ideas? Thanks!