System.ArgumentException: Identifier ' ' is not CLS-compliant.

System.ArgumentException: Identifier ' ' is not CLS-compliant.
Parameter name: ident
   at System.Xml.Serialization.CodeIdentifier.CheckValidIdentifier(String ident)
   at System.Xml.Serialization.CodeIdentifier.EscapeKeywords(String identifier, CodeDomProvider codeProvider, StringBuilder sb)
   at System.Xml.Serialization.CodeIdentifier.GetCSharpName(Type t, Type[] parameters, Int32 index, StringBuilder sb)
   at System.Xml.Serialization.CodeIdentifier.GetCSharpName(Type t)
   at System.Xml.Serialization.CodeIdentifier.GetCSharpName(Type t, Type[] parameters, Int32 index, StringBuilder sb)
   at System.Xml.Serialization.CodeIdentifier.GetCSharpName(Type t)
   at System.Xml.Serialization.TypeDesc.get_CSharpName()
   at System.Xml.Serialization.XmlSerializationWriterCodeGen.WriteElements(String source, String enumSource, ElementAccessor[] elements, TextAccessor text, ChoiceIdentifierAccessor choice, String arrayName, Boolean writeAccessors, Boolean isNullable)
   at System.Xml.Serialization.XmlSerializationWriterCodeGen.WriteMember(String source, String choiceSource, ElementAccessor[] elements, TextAccessor text, ChoiceIdentifierAccessor choice, TypeDesc memberTypeDesc, Boolean writeAccessors)
   at System.Xml.Serialization.XmlSerializationWriterCodeGen.WriteStructMethod(StructMapping mapping)
   at System.Xml.Serialization.XmlSerializationWriterCodeGen.GenerateMethod(TypeMapping mapping)
   at System.Xml.Serialization.XmlSerializationCodeGen.GenerateReferencedMethods()
   at System.Xml.Serialization.XmlSerializationWriterCodeGen.GenerateEnd()
   at System.Xml.Serialization.TempAssembly.GenerateAssembly(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, Evidence evidence, XmlSerializerCompilerParameters parameters, Assembly assembly, Hashtable assemblies)
   at System.Xml.Serialization.TempAssembly..ctor(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, String location, Evidence evidence)
   at System.Xml.Serialization.XmlSerializer.GenerateTempAssembly(XmlMapping xmlMapping, Type type, String defaultNamespace)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type)
   at  .(ProcessParameters )
   at Flame._1._5.beta.Config.ProcessParameters.Save()