A family of Microsoft relational database management systems designed for ease of use.
pattirat,
Did you also try the other methods? Sometimes using all three methods outlined in the article are needed.
Do you have any graphics associated with your file such as a logo? If so, try eliminating that.
Is this file part of a linked structure (e.g. master/subproject or resource pool/sharer)? Those are very susceptible to corruption.
Are you using a network or is the file on your local hard drive?
Does this only happen with that specific file or to all Project files? If this happens with any file you create then there is most likely an issue with Project itself. You could try a repair via the Control Panel.
John