When you can’t use our importer because of a “License Key is invalid”-error, you need to check two things: First, if your license key equals the one defined in your account of the nuvo user platform. Second, if the developerMode property is set to true if you are testing the importer in your dev/staging environment and using the “Dev”-key or if the property equals false if you are using the importer in a production environment and therefore using the “Live”-key.