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Error message

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Uncaught An error has occurred. This is most likely due to security restrictions on reading canvas pixel data with local or cross-domain images.

Uncaught An error has occurred. This is most likely due to security restrictions on reading canvas pixel data with local or cross-domain images.

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This is the error message when checking HTML5 data Locally, not web based.

I've tried about.config and changed privacy.file_unique_origin to false but the error message still comes up