Backup online error

[wilceki]

He stopped working according to db2diag.log

2008-03-14-01.00.00.664553-180 I247032G353 LEVEL: Event
PID : 12315 TID : 2972347312 PROC : db2hmon
INSTANCE: db2inst1 NODE : 000
APPID : *LOCAL.db2inst1.080314040002
FUNCTION: DB2 UDB, Health Monitor, hmonBkpBackupDBOnline, probe:500
START : Automatic job "Backup database online" has started on database SI

2008-03-15-01.00.00.267218-180 I259377G389 LEVEL: Error
PID : 12315 TID : 2960128944 PROC : db2hmon
INSTANCE: db2inst1 NODE : 000
FUNCTION: DB2 UDB, Health Monitor, hmonBkpErrHandFunc, probe:130
CALLED : DB2 UDB, Health Monitor, hmonBkpReadHmonBackupCacheFile
RETCODE : ECF=0x9000001A=-1879048166=ECF_FILE_DOESNT_EXIST
File doesn't exist

2008-03-16-01.00.00.757386-180 I281199G389 LEVEL: Error
PID : 12315 TID : 2949639088 PROC : db2hmon
INSTANCE: db2inst1 NODE : 000
FUNCTION: DB2 UDB, Health Monitor, hmonBkpErrHandFunc, probe:130
CALLED : DB2 UDB, Health Monitor, hmonBkpReadHmonBackupCacheFile
RETCODE : ECF=0x9000001A=-1879048166=ECF_FILE_DOESNT_EXIST
File doesn't exist


----> version
$ db2level
DB21085I Instance "db2inst2" uses "32" bits and DB2 code release "SQL08025"
with level identifier "03060106".
Informational tokens are "DB2 v8.1.1.112", "s060429", "U807381", and FixPak
"12".
Product is installed at "/usr/opt/db2_08_01".


please, can anybody help myself to this to solve?