RMAN-06067: RECOVER DATABASE required with a backup or created control file

I am trying to recover a datafile with rman on different host with the below script. I restored the required control file and mounted the database. I restored the required datafiles with the below script and got error at the last.

I have done  (drop offline) rest of the files with drop offline command.

Please help me on it.

RMAN> run {
2> allocate channel t1 type 'sbt_tape' PARMS="SBT_LIBRARY=/opt/simpana/Base64/libobk.a(shr.o),BLKSIZE=262144,ENV=(CV_mmsApiVsn=2,CV_channelPar=t1)";
3> allocate channel t2 type 'sbt_tape' PARMS="SBT_LIBRARY=/opt/simpana/Base64/libobk.a(shr.o),BLKSIZE=262144,ENV=(CV_mmsApiVsn=2,CV_channelPar=t1)";