无法导入wsdl：portType，wsdl：binding，wsdl：port

使用SVCUtil生成WCF代理时出现错误。错误是

Attempting to download metadata from 'net.pipe://localhost/WebServices/Mgmt.svc' using WS-Metadata Exchange. This URL does not support DISCO.
Error: Cannot import wsdl:portType
Detail: An exception was thrown while running a WSDL import extension: System.ServiceModel.Description.DataContractSerializerMessageContractImporter
Error: Referenced type 'SearchCriteria, Service.DataContracts, Version=2.5.0.0, Culture=neutral, PublicKeyToken=null
t be used since it does not match imported DataContract. Need to exclude this type from referenced types.
XPath to Error Source: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:portType[@name='IMgmt']


Error: Cannot import wsdl:binding
Detail: There was an error importing a wsdl:portType that the wsdl:binding is dependent on.
XPath to wsdl:portType: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:portType[@name='IMgmt']
XPath to Error Source: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:binding[@name='NetNamedPipeBinding_IMgmt']


Error: Cannot import wsdl:port
Detail: There was an error importing a wsdl:binding that the wsdl:port is dependent on.
XPath to wsdl:binding: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:binding[@name='NetNamedPipeBinding_IMgmt']
XPath to Error Source: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:service[@name='Mgmt']/wsdl:port[@name='NetNamedPipeBinding_I


Generating files...
Warning: No code was generated.
If you were trying to generate a client, this could be because the metadata documents did not contain any valid contracts or services
or because all contracts/services were discovered to exist in /reference assemblies. Verify that you passed all the metadata documents to the tool.

Warning: If you would like to generate data contracts from schemas make sure to use the /dataContractOnly option.

一切正常，直到我在数据协定中添加枚举成员。