No js error in console still bootstrap4 tab not working

helllo friends,

Any idea why bootstrap4 tab not working properly?
I dont see any error in console ..
here is my html

<!doctype html> <html class="no-js" lang="zxx"> <head>     <meta charset="utf-8">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <title>Petcare | Template </title>     <meta name="description" content="">     <meta name="viewport" content="width=device-width, initial-scale=1">     <link rel="shortcut icon" type="image/x-icon"...
HTML:

No js error in console still bootstrap4 tab not working