Can't restore from RMAN backup

RMAN> run
2> {
3> host "date";
4> allocate channel t1 DEVICE TYPE 'SBT_TAPE' PARMS="ENV=(NB_ORA_CLIENT=vs-oa00-01b.hosting.local,NB_ORA_POLICY=Oracle_Prod_Policy,NB_ORA_SERV=ps-bcp00-01a.hosting.local,NB_ORA_SCHED=Default-Application-Backup)";
5> restore controlfile to '/u01/app/control01.ctl' from tag 'TAG20120926T053022';
6> release channel t1 ;
host "date";
7> 8> }