UFSDUMP Error

I am using the following line in the script:

ufsdump 0uf /dev/rmt/0cn /disk04/data/archive

The files in the archive folder are all compressed ones with extension .Z

DF -k output is

/dev/dsk/c2t0d0s3 7224905 4603273 2549383 65%/disk04

I am also using a DDS2 tape. But It is always asking for a second tape..

Thanks in advance..