FIX: "The 'Operation' element is not declared" error occurs when you use the WCF-WebHTTP adapter and dynamic send ports in BizTalk Server

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Invalid configuration for the HTTP Method, or the mapping from Operation to HTTP method and Url.

Parameter name: mapping ---> System.Xml.Schema.XmlSchemaValidationException: The 'Operation' element is not declared.

at Microsoft.BizTalk.Adapter.Wcf.Config.AdapterConfigValidationHelper.<ValidateHttpMethodUrlMapping>b__1(Object sender, ValidationEventArgs args)

at System.Xml.Schema.XmlSchemaValidator.SendValidationEvent(XmlSchemaValidationException e, XmlSeverityType severity)

at System.Xml.Schema.XmlSchemaValidator.SendValidationEvent(String code, String arg)

at System.Xml.Schema.XmlSchemaValidator.ThrowDeclNotFoundWarningOrError(Boolean declFound)

at System.Xml.Schema.XmlSchemaValidator.ValidateElement(String localName, String namespaceUri, XmlSchemaInfo schemaInfo, String xsiType, String xsiNil, String xsiSchemaLocation, String xsiNoNamespaceSchemaLocation)