When I try to add users to the site group in Sharepoint, and when I add the user it gives me a correlation ID: I when into the log file and found the error. I tried a few things it suggested on google, but no go.
I tried the IE 9 fix and nothing.
This is the error:
Namespace prefix 'xsd' is not defined. at System.Xml.Serialization.XmlSerializationReader.ToXmlQualifiedName