The file or folder name contains characters that are not permitted

This is a very misleading error message to get, especially when the cause and solution has NOTHING related to what the message is referring to.

I came across this error while attempting to deploy my site definition. I added a few things to my site definition, one of these was a aspx page referring to my master page.

The error:

<%@ Page language=”C#” MasterPageFile=~masterurl/custom.master” …../>

The fix:

<%@ Page language=”C#” MasterPageFile=”_catalogs/masterpage/custom.master” …../>



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