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How can I get rid of this error. I ran kdbfchk on the xbooknum file and it says its ok.
bambi:/db/tables/maint # tsql "delete from books where BOOKNUM = '1511317175'"
Texis Version 04.00.1017856611(20020403) Copyright (c) 1988-2002 Thunderstone EPI

000 Unable to read page 0x1ABF0C6 from btree /internal/maint/xbooknum.btr; wanted 8192 bytes, got 0 in the function btgetpage
005 Can't get page 0x1ABF0C6 of B-tree /internal/maint/xbooknum.btr in the function [vbt]search
005 Corrupt operation at 0xF1100000000 in KDBF file /internal/maint/xbooknum.btr: error 0: Unknown (Read past EOF) in the function read_head
000 Bad block header at 0xF1100000000 in KDBF file /internal/maint/xbooknum.btr in the function kdbf_read
000 Unable to read page 0xF1100000000 from btree /internal/maint/xbooknum.btr; wanted 8192 bytes, got 0 in the function btgetpage
005 Can't get page 0xF1100000000 of B-tree /internal/maint/xbooknum.btr in the function vbtgetnext

rebuild the index with the error, xbooknum.