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Assertion Failed!: $A.addValueProvider(): '$Record' has already been registered. : false
Can anyone help? I get this error message when click to run the Lightning Experience Migration Assistant. It worked previously and all of a sudden I now get this error. I am also getting this error in my sandbox.
Sorry for this issue you are encountering.
It looks like an issue related to the bug below. You can try following the workaround and hopefully, it gets sorted out:
I hope this helps!
Thanks,
Nagendra