Experimenting with the XSD's for the CoreFilingMessage and found it wouldn't validate using this online webservice based validator site:
http://www.xmlme.com/Validator.aspx
I had a similar error following other VB.NET programming exercises and Java exercises in the past.
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Schema Error: System.Xml.Schema.XmlSchemaException: The targetNamespace parameter '' should be the same value as the targetNamespace 'urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CoreFilingMessage-3.1' of the schema. at System.Xml.Schema.BaseProcessor.SendValidationEvent(XmlSchemaException e, XmlSeverityType severity) at System.Xml.Schema.SchemaCollectionPreprocessor.Preprocess(XmlSchema schema, String targetNamespace, Compositor compositor) at System.Xml.Schema.SchemaCollectionPreprocessor.Execute(XmlSchema schema, String targetNamespace, Boolean loadExternals, XmlSchemaCollection xsc) at System.Xml.Schema.XmlSchema.CompileSchema(XmlSchemaCollection xsc, XmlResolver resolver, SchemaInfo schemaInfo, String ns, ValidationEventHandler validationEventHandler, XmlNameTable nameTable, Boolean CompileContentModel) at System.Xml.Schema.XmlSchemaCollection.Add(String ns, SchemaInfo schemaInfo, XmlSchema schema, Boolean compile, XmlResolver resolver) at System.Xml.Schema.XmlSchemaCollection.Add(String ns, XmlReader reader, XmlResolver resolver) at System.Xml.Schema.XmlSchemaCollection.Add(String ns, XmlReader reader) at Validator.Button1_Click(Object sender, EventArgs e)