I have created an API Gateway and a lambda on AWS. I use them for an application. I'm having issues with certification error on the lambda call. So I created a certificate and I linked it to my api gateway. AWS say me that I'm gonna pay (too much) so I tried to remove the certificate, then this error happened.
remove the association of ACM certificate from API Gateway first.
Guide: https://aws.amazon.com/premiumsupport/knowledge-center/acm-certificate-resources/