Phase 1 import failed with 252 error

Hi All,

I am trying to import images at DR site and getting below error for few tapes

4/13/2015 1:18:37 PM - begin Import
4/13/2015 1:18:39 PM - Error bpimport(pid=10688) Status = extended error status has been encountered, check logs.  
4/13/2015 1:18:39 PM - end Import; elapsed time: 0:00:02
4/13/2015 1:18:39 PM - requesting resource PD1170
4/13/2015 1:18:39 PM - Error nbjm(pid=8348) NBU status: 830, EMM status: No drives are available   
4/13/2015 1:18:39 PM - Error nbjm(pid=8348) NBU status: 830, EMM status: No drives are available   
4/13/2015 1:18:40 PM - Info bptm(pid=10872) start           
4/13/2015 1:18:40 PM - started process bptm (10872)
4/13/2015 1:18:40 PM - Error bptm(pid=10872) NBJM returned an extended error status: No drives are available (2001) 
extended error status has been encountered, check logs(252)
4/13/2015 1:18:40 PM - Info bptm(pid=10872) EXITING with status 252 <----------