Hey @ML01! Looks like another thread also ran into the same issue: http://community.retool.com/t/problem-with-license-retool-onpremise-api/17507
Pasting my questions here as well:
Just to double check, was your Retool instance working before? And how have you deployed Retool?
Usually this error means your license key is either incorrect or missing (thank you for sending those logs by the way) and this causes your license checks 8 to fail (your Retool instance pings our servers every 6 hours to ensure that your license key is valid).
This can also happen if you have a trailing whitespace at the end of your license key (most common in Kubernetes deployments).
Also, have you set your version to the hardcoded version number (e.g. 2.110) or to 'latest'? Setting the version to 'latest' often breaks things!