Cannot insert async ad code for verify your site by adsense 2017

When you are new to adsense from blogger, you have finished inserting all the code ,but you cannot insert the code of adsense website verify code
I am sure that google will solve this problem as sometime this may also not help
Use this code if you are getting this error

Error  XML, line 1958, column 15: Attribute name "async" associated with an element type "script" must be followed by the ' = ' character.

then follow this step

just change the async to async=''async"

this will solve you proble

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

to

<script async="async" src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>