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Suddenly I can't get QuickTime Player to work anymore because it crashes right after opening it. I do not know if this is the right error message from the log:

Application Specific Information:
Sandbox creation failed: Container object initialization failed.
NSCocoaErrorDomain:512

Does anyone know how to fix the problem or how to reinstall the application even if it's a system app?

4
  • What version of Quicktime Player?
    – IconDaemon
    Commented Mar 14, 2016 at 12:48
  • Assuming your home directory is in its default installation place (i.e. you haven't moved it, or net boot) and, judging by the word "Suddenly", this is not the first time you attempt to launch QuickTime Player X, have you tried removing the container? ~/Library/Containers/com.apple.QuickTimePlayerX
    – Redarm
    Commented Mar 14, 2016 at 14:12
  • OK, removed it and the player works again. Thanks! :)
    – ITJ
    Commented Mar 16, 2016 at 9:11
  • Btw, should I delete my question now or what?
    – ITJ
    Commented Mar 16, 2016 at 9:51

2 Answers 2

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As @Redarm suggested, you should remove the folder found at

~/Library/Containers/com.apple.QuickTimePlayerX

After that, quit and reopen QuickTime.

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  • 1
    In case it helps, I got this error after installing Soundflower - some drivers to be able to record the output from the Mac - my Mac is the base model 16" 2019 model Commented May 22, 2020 at 9:52
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I had a slightly similar fix on Mac Catalina. I searched for "com.apple.QuickTimePlayerX" in Finder, right clicked it, clicked "Show in Enclosing Folder" and then saw it was in a folder called "Autosaved Information".

It looks like it was holding on to some sort of corrupted video file that crashed QT, so every time I would open QT it would try to open the video, causing it to crash, and on and on.

Once I deleted everything in the Autosaved Information folder it worked again.

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