When performing a test run, I get the errors below. Can someone help?

Error: No devices found to run job.
Error: Online media check : Insufficient online or nearline media is available
to start
job.Overwrite media check: There is no media online or nearline that can
overwritten or the job has been marked append/terminate.Media check status
Error: Job started : Thursday, December 23, 2004 2:18:23 PMJob ended
Thursday, December 23, 2004 2:18:31 PMFinal error: 0xa0008703 - Job failed

running its test run. See logfile for details.
Final error category: Job ErrorsCompleted status: Failed