Resolve XHTML markup is incorrect near placeholder “header” Error, only for “header” key

Lets start with our problem, We were facing a weird issue in experience editor, where we are getting following error – XHTML markup is incorrect near placeholder “header”. For more information about this issue refer to Sitecore Knowledge base article https://kb.sitecore.net/articles/365101. I know this error message shows when there some XHTML validation problem. But In […]