function
  
modo_manutencao() { 
  
if
  
( !current_user_can( 
'edit_themes'
  
) || !is_user_logged_in() ) { 
die(
'Site em Manutenção'
); 
} 
} 
add_action(
'get_header'
, 
'modo_manutencao'
);<br />
<b>Fatal error</b>:  Call to undefined function is_video() in <b>/data/23/4/68/48/4231374/user/4794707/htdocs/animes/wp-content/themes/detuube/single.php</b> on line <b>20</b><br />