tape drive problem

Came in this morning and finds that most of my weekend jobs failed to run.  The error messages are shown below.

 

Cannot open exchanger control device ([2] The system cannot find the file specified. )

The device "HP:MSL6480_vhcradmslsvr" could not be opened("Device could not be accessed")

Device address not found

Cannot open exchanger control device (Device type mismatch

 

Also, looking at the Devices list, one of the 4 drives is yellow.