Getting issue with setting custom domain

Getting the below error when deploy using the custom domain:
04:00:44PM UPDATE_FAILED AWS::CloudFormation::Stack ApiGateway Embedded stack arn:aws:cloudformation:us-east-1:793735371217:stack/sonder-list-afterburber-dev-ApiGateway-1IR36NUICND15/c967a170-7402-11ea-a67e-124c09213289 was not successfully updated. Currently in UPDATE_ROLLBACK_IN_PROGRESS with reason: The following resource(s) failed to create: [DomainName].
04:00:55PM UPDATE_FAILED AWS::CloudFormation::Stack JetsPreheatJob Resource update cancelled
04:00:56PM UPDATE_FAILED AWS::CloudFormation::Stack NotificationJob Resource update cancelled

My application.rb is:
Jets.application.configure do
config.project_name = “sonder-list-afterburber”
config.mode = “api”
config.controllers.default_protect_from_forgery = false

config.domain.hosted_zone_name = “ = “www.sonderhcm”
config.domain.cert_arn = “CERT”

Can some one please help me as I am stuck for many days here.