Error code when adding colors to my product

Store Design
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1

I added some colors with pictures to some of my tshirts on my US market, but when I tried to do the same thing with the tshirts from my EU market I get a error code: “There is 1 error with this product: Something went wrong, please try again”. The product has a different fabric and some different color variants for which I added the colors to the metafields. When I try to save my work it gives a error code and erases the metafields.