Physical volume library drive or Robot paused, offline or disabled

Hi all,

I had opened up the magzine of the autoloader and replace the tape manually. After that, I encountered the error whenever I tried to bring the robotic library online and which I swop back to the original tape. 

Now, how do I resolved this and what would be the correct procedures to replace the tape from the autoloader using BE2012?

Regards,

Qingyan