The error is returned by Amazon API if your product data is not eligible for a new ASIN creation.
Please make sure that your product identifier is valid for this particular product and provided in a correct format, i.e. 12-digit UPC, 12 or 13-digit EAN, 10 or 13-digit ISBN.
Otherwise, please contact Amazon to clarify which data contradicts their rules.
You may email M2E Pro Support to get the product data report that is submitted during the List action. It can be included in your Amazon request for completeness.