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Error message

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vivascott
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An error occurred running the Unity content on this page. See your browser JavaScript console for more info. The error was: InvalidStateError: A mutation operation was attempted on a database that did not allow mutations. got this message while playing a FB game. I don't have Unity or JavaScript on my computer as I did a search for them. Whats going on and how to fix this on Windows 7

An error occurred running the Unity content on this page. See your browser JavaScript console for more info. The error was: InvalidStateError: A mutation operation was attempted on a database that did not allow mutations. got this message while playing a FB game. I don't have Unity or JavaScript on my computer as I did a search for them. Whats going on and how to fix this on Windows 7