I create a plugin in which a form have a two button, first button goes to next page and second button goes to same page. When I come on same page it is showing an error :
Fatal error: Call to undefined function add_shortcode() in C:\wamp\www\sanyam\wp-content\plugins\a.php on line 31
none-aa.php is a different page on action.
The error says, they you call undefined function add_shortcode(). Post some code to better identify problem.