Armstrong theme does not have a valid license key assigned. This usually happens either because you have not yet assigned a license key or because your WordPress Address domain does not match the license key. To fix this, go to the Armstrong License Configuration page and enter the the correct license key.
If you have changed your domain, you need to update your license in the Armstrong Customer License Manager. You will be issued a new key that you must update in the Armstrong License Configuration page.
If you are an administrator, you can still access the WordPress dashboard: Click Here