Error in woocommerce-amazon-affiliates-light-version

I am receiving following error in woozone light version

This states there is some problem with my amazon account accesskey
but when i used the same key with other plugin it worked and search for products

Amazon error id: AWS.InvalidAccount:
Your AccessKey Id is not registered for Product Advertising API. Please use the AccessKey Id obtained after registering at https://affiliate-program.amazon.com/gp/flex/advertising/api/sign-in.html.

https://www.ads-software.com/plugins/woocommerce-amazon-affiliates-light-version/