Your license key doesn’t match your current domain. This is most likely due to a change in the domain URL of your site (including HTTPS/SSL migration). Please deactivate the license and then reactivate it again.
We bought an extended license to be able include it in our theme, and we own only one license key (as well as in case with single license), theme buyers are not allowed to use that key. On this version, you just use some function, so if you want to use the full functionality you have to buy a premium version.