Description: The current item has an operand marked as an offset, but IDA cannot find the offset base in the database.
Possible reason(s): The database is probably corrupted. This may occur if the database was corrupted and repaired.
What to do: Mark the operand again as an offset. Use one of the following commands: Convert to offset (DS) Convert to offset (CS) Convert to offset by any segment Convert to offset by any user-specified base