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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?

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  • What version of Quicktime Player? – IconDaemon Mar 14 '16 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 Mar 14 '16 at 14:12
  • OK, removed it and the player works again. Thanks! :) – ITJ Mar 16 '16 at 9:11
  • Btw, should I delete my question now or what? – ITJ Mar 16 '16 at 9:51
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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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    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 – bernieslearnings May 22 '20 at 9:52

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