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Cannot open the block diagram of a previously saved vi


I built a project and a VI under it yesterday, and saved them all. But today when i open the VI, I found the front panel became grey, and the bock diagram cannot open with "Ctr-E", or from the tag " window-> left and right". Does anybody know the causes.  Thanks a lot 


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Could you have somehow saved it with the block diagram removed?


Perhaps it was a corrupted save.


You'll have to go to your source code backup system to retrieve an earlier copy.

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