When i am taking export i am getting this error.

EXP-00007: dictionary shows no columns for USERNAME.TABLENAME.
(Around some 5 tables in particular schema)

All these tables exist; but when EXPORT utility tries to export it throws this error.

But rest of the table in the user gets exporte fine and at the end it says export terminsted succesfully with warnigns.

I am using 8i on winNT and doing userlevel export.

Any ideas abt the same ?