The file cannot be opened. error message when tying to save .mpp file

[Gene]

This is the most unusal thing I have ever seen.
I have a .mpp project that I have been updating for months. Today when
I tried to save it or even save as I get a file open error.

The File cannot be opened.
Check that the File name and path are correct.
Check that the File format is recognized by Project.
Project Files saved in a version earlier than Microsoft Project 98
can't be opened.
If your File is From an earlier version, open it in that version, click
Save as (File menu), and save in MPX Format Open the MPX File. When
you use this method, project data is imported, but Formatting is lost.

As a work around, I was able to save it as an XML file and open with
project to restore its format.

Anyone know what is happening here?

GENE

 

[kix1956]

Gene I would check with the Project Server administrator and find out
if a Service Pack has been applied to the server. It could be that your
level of MS Project Professional is out of date, in terns of the
service that you have applied, and Project is now having problems
interfacing with the upgraded Server. I have run into similar problems
recently with a user that had not applied service to his Project Pro
instance.