Cannot find ContentPlaceHolder 'head' in the master page '/Master_pages/SecondLevel.master', verify content control's ContentPlaceHolderID attribute in the content page.
I'm puzzled how to fix this. I have three master pages:
MainMasterPage.master - No problems here, I can use this master page in webforms.
SecondLevel.master - has errors
CustomerInfoBar.master - has errors
I can post more details if need be.
Thank you if you can help.
...
Go to the complete details ...