Error Code 18560
This error code means that at least one of the required fields related to your product is missing, preventing Amazon from integrating it into its marketplace. The Product was not created due to a missing product ID.
Solution:
In order for your product to be sold on Amazon, you must fill in the missing value in your Amazon feed. This might be an EAN code, the brand, or the type of product.
https://sellercentral.amazon.in/gp/help/external/200692370