Saving a CS4 InDesign file in CS5 gives me an error

i have indesign file created in cs4, when opened in cs5, error saying:

 

"cannot save 'filename.indd' under new name"

 

i tried export idml suggested in forums, error message stating:

 

"disk may locked or full"

 

i can open document in cs5 fine, when try save changes, gibes me original error stated above.

 

thanks...

what os?

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