Trouble with Error Msg: Attribute name "async" associated with an element type "script" must be followed by the ' = ' character"

If you get an error like this when implementing Google Adsense Code ...

Attribute name "async" associated with an element type "script" must be followed by the ' = ' character.".

The software device is looking for proper XHTML for the async snippet that is HTML5 compatible.

Try replacing <script async src="...">

with

 <script async="async" src="...">.