Description:
EtsyError: There was a problem with /values : cannot be more than 70 items
This means you have too many variants of a product. The maximum number of variants allowed is 70.
The number of variants is calculated by adding the number of variants with the number of dummy variants. For more information on dummy variants visit the What are Dummy Variants article.
Solution:
To fix this you will need to remove some variants or dummy variants from the listing.