J9CMOD,
I would check a couple things. First be sure you are indexing with the correct format or if you are off by a column. We load the z/OS system log from multiple LPARS and they all come in as VB. Also, sometimes temporarily switching to the ACIF indexer will get you a more descriptive error message. For TRIGGER1 we use the SYSID for each LPAR and we store the time in a Transaction Field so we get the begin and end times of the log.
CC=YES
CCTYPE=A
CONVERT=NO
CPGID=500
MCF2REF=CPCS
TRC=NO
FILEFORMAT=RECORD
TRIGGER1=*,12,X'D7F2D6C6E3',(TYPE=GROUP) /* P2OFT */
FIELD1=0,12,6,(TRIGGER=1,BASE=0)
FIELD2=0,21,5,(TRIGGER=1,BASE=0)
FIELD3=*,*,8,(OFFSET=(27:34),MASK='##:##:##',ORDER=BYROW)
INDEX1=X'D985979699A36DD5819485',FIELD1,(TYPE=GROUP,BREAK=NO) /* Report_Name */
INDEX2=X'D396876DC481A385',FIELD2,(TYPE=GROUP,BREAK=NO) /* Log_Date */
INDEX3=X'D396876DE3899485',FIELD3,(TYPE=GROUPRANGE,BREAK=NO) /* Log_Time */
DCFPAGENAMES=NO
UNIQUEBNGS=YES
LINECNT=60
GROUPMAXPAGES=5000
IMAGEOUT=ASIS
INDEXOBJ=ALL
INDEXSTARTBY=1
INSERTIMM=NO
RESTYPE=NONE