Unable to create multivariants

hello
during creation of multivarient without numeric value i am getting these error

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please help me to solve this

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In the subject line I corrected a spelling error, to help with general searchs.

I ran into this error also (it might be a bug). I WAS able to create single variants and since I only had 5, I just did them one at a time.

but iam not able to create multi variant for non numeric attribute , Single i can make no issue, but for multivariant i need solution ???