Google ads do not appear on my blog


Hi, i got an error on my blog regarding google ads. Can you check the attached file and advise me what fixes needed to correct my blog to correct my corrupted template and correct the following script code for my blog?

*i replced my id with xxxxxxxxxxxxxx

(adsbygoogle = window.adsbygoogle || []).push({ google_ad_client: "ca-pub-xxxxxcxxxxxxx", Editing your template so it mixes HTTP and HTTPS may affect the security and user experience of your blog when it is viewed over HTTPS. Learn more. Hide warning Error parsing XML, line 4, column 23: Attribute name "async" associated with an element type "script" must be followed by the ' = ' character. Please advise!