Networker : Error reading volume label :read open error, no tape in the specified device

Hi guys,

We are having one old server running Networker 7.6 on Windows 2008 OS used to backup data on LTO-5 tapes with Tandberg T24 tape library.

We are trying to recover some data using "Networker User" application and I am getting all the directory hierarchy (index) in that. After selecting the desired files and starting the recover operation, the management console shows the following error : 

Error reading volume label : read open error, no tape in the specified device.

Error reading volume label : read open error, no tape in the specified device.

Media critical event : waiting for LTO Ultrium-5 tape A00010 on server2

Verify label operation in progress

Eject operation in progress

Error reading volume label : read open error, no tape in the specified device.

I really have no clue what and where to check as I am very new to the system.

Any help would be greatly appreciated.

Thanks