Error message: "my bits moved right off the end of the world!"

I'm developing application with Borland C++ Builder as a client and PostgreSQL as a server. Sometime (Almost every other time) the application failed to get loaded and I get an error message in psqlodbc_xxxxxxxxxxxx.log file:

[...]
conn=58919036, query='CREATE TABLE course_dl_tmp10183 (brig_id int2, well varchar(10), pad varchar(7), date_dl date, course_id int2, what varchar(4), course_what varchar(60), course_value time, PRIMARY KEY (course_id));'

NOTICE from backend during send_query: 'NOTICE: CREATE TABLE/PRIMARY KEY will create implicit index 'course_dl_tmp10183_pkey' for table 'course_dl_tmp10183''

ERROR from backend during send_query: 'FATAL 1: my bits moved right off the end of the world! Recreate index pg_attribute_relid_attnum_index.'
conn=58919036, query='COMMIT'

Could anybody tell me what does this error message "my bits moved right off the end of the world!" mean.

Client software:
MS Windows 98
Borland C++ Builder 5.01
BDE 5.1.1
ODBC 3.510.3711.0
PsqlODBC 6.50.0000

Server software
Linux (Dedian woody, kernel 2.2.17, libc6 2.2)
PostgreSQL 7.0.3

Thank you, Mikhail.