Archive: Error reading reserved pages

I use ONLINE 5.10.UC7. Archive (using tbmonitor ) gives the following: Error reading reserved pages Quickie backup to /dev/null works fine of course. in "tbconfig" # Archive Tape Device TAPEDEV /dev/rmt/0 # Archive tape device pathname TAPEBLK 16 # Archive tape block size (Kbytes) TAPESIZE 2048000 # Max amount of data to put on tape (Kbytes) # Logical Log Backup Tape Device LTAPEDEV /dev/null # Logical log tape device pathname LTAPEBLK 16 # Logical log tape block size (Kbytes) LTAPESIZE 2048000 # Max amount of data to put on log tape (Kbytes) The result of 'tbcheck -cr ' shows: >> Validating INFORMIX-OnLine reserved pages Validating PAGE_PZERO... Invalid page header for PAGE_PZERO. Validating PAGE_CONFIG... Validating PAGE_1CKPT & PAGE_2CKPT... Using check point page PAGE_2CKPT. Validating physical log pages ... Validating logical logs ... Validating PAGE_1DBSP & PAGE_2DBSP... Using dbspace page PAGE_2DBSP. Validating PAGE_1PCHUNK & PAGE_2PCHUNK... Using primary chunk page PAGE_1PCHUNK. Validating PAGE_1ARCH & PAGE_2ARCH... Using archive page PAGE_1ARCH. <<< Thank you for your help. Irina Kovalchuk National TechTeam, Inc. Corporate Information Systems Ph: (313) 277-2277x7014 Fax: (313) 277-6409