rman and omniback integration

[moekti]

Dear all,
I try to restore a full database 8.1.7 using backup files that is produced by omniback II in Windows 2000.
The full online database backup is done succesfully . Then I deleted all datafiles including the controlfiles after I had shut the database down. I don't use a recovery catalog database, so the controlfiles must be restored first. I started the database to the nomount position and run the restore command. But it failed with this message:
RMAN> run{
2> allocate channel t1 type 'SBT_TAPE';
3> restore controlfile;
4> }

RMAN-03022: compiling command: allocate
RMAN-03023: executing command: allocate
RMAN-08030: allocated channel: t1
RMAN-08500: channel t1: sid=14 devtype=SBT_TAPE
RMAN-08526: channel t1: HP OpenView OmniBack II A.04.10/176

RMAN-03022: compiling command: restore

RMAN-03022: compiling command: IRESTORE
RMAN-03026: error recovery releasing channel resources
RMAN-08031: released channel: t1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure during compilation of command
RMAN-03013: command type: restore
RMAN-03002: failure during compilation of command
RMAN-03013: command type: IRESTORE
RMAN-06003: ORACLE error from target database: ORA-01507: database not mounted
ORA-06512: at "SYS.X$DBMS_RCVMAN", line 4461
ORA-06512: at line 1
RMAN-06097: text of failing SQL statement: begin dbms_rcvman . setDatabase ( upper ( :dbname:dbname_i ) , :rlscn , :rltime , :fhdbi:fhdbi_i ) ; end ;
RMAN-06099: error occurred in source file: krmk.pc, line: 9196

Please advise...