Moving a theme from one site to another

Hi. I am trying to move a them from http://www.one-resource.com/ to http://one.allanlove.net and am having some issues. I copied the theme folder from the first site and pasted it in to the correct folder on the second site. The theme showed up just fine so I activated it.
I am seeing the following error and wondered if you could help me fix it please?
Fatal error: Call to undefined function get_field() in /home/allanet/public_html/one/wp-content/themes/oneresource2016/inc/header.php on line 147

Thanks

Allan