Can't open the info.plist in Xcode

when i try to open info.plist in xcode i got an internal error :

[PBXFileReference plistStructureDefinitionIdentifier]: unrecognized select or sent to instance 0x30d0f80
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I'm running on xcode 3.1 and iphone sdk 3.0 on VMWare Application type : Cocoa Touch Application

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Try opening with some text editor and check if it is not corrupted or bad formatted. Can you open another info.plist? Does this happen only with one file?