My SharePoint application gives this error after I put the Fontawesome link Fontawesome online link in my master page:

<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">

It gives error as below:

Literal content (' ') is not allowed within a System.Web.UI.UpdatePanelTriggerCollection'

I removed the font link but still the error exist. I don't know what is the cause of this error and how to solve it.

2 Answers 2


The Literal content (' ') is actually an html non-breaking space that gets added when editing the page in SharePoint Designer for the first time. It appears around line 354 of the default seattle.master page [I haven't tried with the other default master pages].

        <asp:PostBackTrigger ControlID="WebPartAdder" />
    &nbsp; </Triggers>

Remove the $nbsp; and save the page again to clear the error. I found that after it is removed the first time its won't re-appear in future edits.

  • Great.It worked!!. it saved lots of my time. thanks Commented Feb 9, 2016 at 11:40

The same issue was happened with me once, but I searched this for and found that my Content Placeholders were in small letter. After I changed them to capitalized form the issue was resolved for me.

In case if you are using page layout with this, verify the same for Content in page layout also.

If you find this as right solution, mark this as answer. So others can get their solutions too. :)

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