QuickTime error 2048 indicates that the file is not properly formatted for QuickTime. This can occur if you navigate to a file that is not a movie file. Try navigating to the same file and playing it in QuickTime.

On Windows, if you try to open a Logger Pro file (.cmbl) from the Insert > Movie option, it will fail with this error message. For the correct location of sample movies in Logger Pro, see:
Where does Logger Pro install its sample video files on Windows?

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My video doesn't open in Logger Pro or Vernier Video Analysis. What can I do?