title: Error: A theme has not been assigned to this store opencart error
body: <p>I am new to OpenCart and using OpenCart version 2.3.0.2 . I want to change all HTML webpages so I tried to use custom theme. I follow steps from this example: <a href="http://undefined.gr/site/2016/10/09/custom-opencart-2-3-0-2-theme/" rel="nofollow noreferrer">http://undefined.gr/site/2016/10/09/custom-opencart-2-3-0-2-theme/</a> but getting error: A theme has not been assigned to this store! Please let me know how to solve this!</p>