Exclusive OR Shared Mode

I have a project in PRIMAVERA P6 which is opening only in shared mode. While pressing F9 for schedule also message is showing that some other user opened the project. i tried to change to exclusive mode by File > Open, but exclusive button is Disabled (Not available). I am 100% sure that it is NOT opened by any body. how i can come up from this... any suggessions.... Please.

regards

Mehas

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