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Call to undefined function add_menu_page() on theme activation

I am attempting to activate a theme that works perfectly on one WordPress install. I have matched the plugins installed up and copied the theme over but when I go to activate it I get... Fatal ...
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113 views

Fatal error when using '#' character as an admin menu link title

When I try to title an admin menu link # or #, I get a fatal error before the admin menu is loaded: Fatal error: Cannot access empty property in ...