Not working with Ad manager code

Works only on Adsense but after wrapping it with ad manager code, <script async src=”https://securepubads.g.doubleclick.net/tag/js/gpt.js”></script><script&gt; window.googletag = window.googletag || {cmd: []}; googletag.cmd.push(function() { googletag.defineSlot(‘/23073730999/Mobile_top’, [[320, 100], [300, 250]], ‘div-gpt-ad-1711783900495-0-0′).addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.enableServices(); });</script><!– /23073730999/Mobile_top –><div id=’div-gpt-ad-1711783900495-0′ style=’min-width: 300px; min-height: 100px;’> <script> googletag.cmd.push(function() { googletag.display(‘div-gpt-ad-1711903200495-0’); }); </script></div> it does not work