Use following steps to fix this problem.
1.First download and install BBEdit in your computer.
2.Now go to the iMovie projects folder -> now control click on the project -> now choose the "Show Package Contents" -> you will find some video file there.
3.Choose particular file and make a copy of it.
4. Now open file with BBEdit.
5.Now go to find option and type in ">-" then click "Find All" . Then you will get following output.
Code:
<integer>-1</integer>, or this: <real>-0.47999998927116394</real>.
6. just remove thee "-" in front of the numbers.
7. Save the file.
8.Now try to open iMovie.
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