Backup job failed

Hi All,

One of my production server backup job failed. Please help to resolve this issue.

Executed as user:  Cannot open backup device '    '. Operating system error 32(failed to retrieve text for this error. Reason: 15105). [SQLSTATE 42000] (Error 3201)  BACKUP DATABASE is terminating abnormally.
[SQLSTATE 42000] (Error 3013).  The step failed.

Thanks in advance.....