ORA-19906 when cloning a database

Hi,
A follow-up for the rman-cloning issues of approx. 3 weeks ago.
Our production-database is being cloned daily to another database.
This process is automated and works well. Only the last few days the recover fails;

End of cloning-log:

contents of Memory Script:
{
   set until scn  11494106011;
   recover
   clone database
    delete archivelog
   ;
}
executing Memory Script

executing command: SET until clause

Starting recover at 06-JAN-11

starting media recovery

archive log thread 1 sequence 288 is already on disk as file \\10.199.180.5\VOL\AC_AA2_VOL006\ORACLE_BACKUP\ARCHIVELOG\XMCP\XMCP_1_288_737995547.ARC
archive log thread 2 sequence 362 is already on disk as file \\10.199.180.5\VOL\AC_AA2_VOL006\ORACLE_BACKUP\ARCHIVELOG\XMCP\XMCP_2_362_737995547.ARC