after installing pie register, anytime i log in it redirects to an error page with Warning: call_user_func() expects parameter 1 to be a valid callback, function ‘s.t.r.r.e.v’ not found or invalid function name in /home/content/p3pnexwpnas01_data02/47/2208547/html/wp-content/themes/voice/include/helpers.php on line 1894