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We are using sp2010. We have a sp site. There are some libraries. There is one user which got an error when he search on a user in people picker. When he clicks on ok he got this error :

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uls error:

System.InvalidOperationException: Namespace prefix 'xsd' is not defined. at System.Xml.Serialization.XmlSerializationReader.ToXmlQualifiedName(String value, Boolean decodeName) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderDictionaryEntryArray.Read1_Object(Boolean isNullable, Boolean checkType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderDictionaryEntryArray.Read2_DictionaryEntry(Boolean checkType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderDictionaryEntryArray.Read3_ArrayOfDictionaryEntry()

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fixed by my self. I checked the checkbox of enable compatibility mode for intranet sites. Now this sharepoint site is running under compatibility mode and the people picker is working fine.

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