You don’t appear to be using any Close CRM webhooks in these screenshots.
This error is happening because at some point you set up a webhook with Close, and they are unable to send the data to the URL you set up. (likely you deleted the webhook on Make.com, but not in Close)
The emails should provide you with the webhook ID and the URL to which it is attempting to send the data. You should review this webhook and delete it if you don’t need it.
Delete using API call below, replace the ID with your webhooks ID
