Rman restore database with skip tablespace then switch datafile all fails RMAN-03002

Hi Here is my RMAN script which is restoring a database to a new location but skipping the  tablespace documents (it had worked when restoring the full database), when it comes to the swich datafile all it falls over with the

failure of the switch datafile all command, any ideas how this can be resolved? Many thanks.

RMAN> connect target *

2> run {

3> set newname for database to "/oracle/data/wsuss/%U";

4> set newname for block change tracking file to "/oracle/data/wsuss/block_change_tracking.bct";

6> sql "alter database disable block change tracking";

7> sql "alter database rename file ''/oracle/mosprd/oradata/mosprd/redo01.log'' to ''/oracle/data/wsuss/redo01a.log''";