c# - An exception was thrown in a call to a WSDL export extension - WCF -

i trying connect webservice windows form application, when try open link webservice browser error message:

an exceptiondetail, created includeexceptiondetailinfaults=true, value is: system.invalidoperationexception: exception thrown in call wsdl export extension: system.servicemodel.description.datacontractserializeroperationbehavior  contract: http://tempuri.org/:imobilews ----> system.invalidoperationexception: request in operation uploadfile stream operation must have single parameter type stream.    @ system.servicemodel.dispatcher.streamformatter.validateandgetstreampart(messagedescription messagedescription, boolean isrequest, string operationname)    @ system.servicemodel.dispatcher.streamformatter.create(messagedescription messagedescription, string operationname, boolean isrequest)    @ system.servicemodel.description.messagecontractexporter.exportmessage(int32 messageindex, object state)    @ system.servicemodel.description.messagecontractexporter.exportmessagecontract()    @ system.servicemodel.description.wsdlexporter.callextension(wsdlcontractconversioncontext contractcontext, iwsdlexportextension extension)    --- end of inner exceptiondetail stack trace ---    @ system.servicemodel.description.servicemetadatabehavior.metadataextensioninitializer.generatemetadata()    @ system.servicemodel.description.servicemetadataextension.ensureinitialized()    @ system.servicemodel.description.servicemetadataextension.httpgetimpl.initializationdata.initializefrom(servicemetadataextension extension)    @ system.servicemodel.description.servicemetadataextension.httpgetimpl.getinitdata()    @ system.servicemodel.description.servicemetadataextension.httpgetimpl.tryhandledocumentationrequest(message httpgetrequest, string[] queries, message& replymessage)    @ system.servicemodel.description.servicemetadataextension.httpgetimpl.processhttprequest(message httpgetrequest)    @ syncinvokeget(object , object[] , object[] )    @ system.servicemodel.dispatcher.syncmethodinvoker.invoke(object instance, object[] inputs, object[]& outputs)    @ system.servicemodel.dispatcher.dispatchoperationruntime.invokebegin(messagerpc& rpc)    @ system.servicemodel.dispatcher.immutabledispatchruntime.processmessage5(messagerpc& rpc)    @ system.servicemodel.dispatcher.immutabledispatchruntime.processmessage11(messagerpc& rpc)    @ system.servicemodel.dispatcher.messagerpc.process(boolean isoperationcontextset) 

in third line noticed in uploadingfile function:

system.invalidoperationexception: request in operation uploadfile stream operation must have single parameter type stream

this uploadfile function:

// in interface [operationcontract]     [webinvoke(method = "post", uritemplate = "/uploadfile/{senderid}/{filename}"       , responseformat = webmessageformat.json)]     string uploadfile(string senderid, string filename ,stream image);  // implementation public string uploadfile(string senderid, string filename, stream image)     { // ..... unwrapping stream , saving file } 

this function works uploading images without problems. why message appearing?

note: tried ansowers in this question, did not work

this web config file:

<?xml version="1.0" encoding="utf-8"?> <configuration>   <configsections>      <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entityframework, version=6.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" requirepermission="false" />    </configsections>    <appsettings>     <add key="aspnet:usetaskfriendlysynchronizationcontext" value="true" />   </appsettings>    <system.web>     <compilation debug="true" targetframework="4.5" />     <httpruntime />     <pages controlrenderingcompatibilityversion="4.0" />   </system.web>    <system.servicemodel>     <services>       <service name="myportal.mobilews" behaviorconfiguration="servicebehavior">         <endpoint binding="webhttpbinding" contract="myportal.imobilews" behaviorconfiguration="webhttp" />       </service>     </services>      <behaviors>       <servicebehaviors>         <behavior name="servicebehavior">           <servicemetadata httpgetenabled="true" httpsgetenabled="true"/>           <servicedebug includeexceptiondetailinfaults="true" />         </behavior>       </servicebehaviors>        <endpointbehaviors>         <behavior name="webhttp">           <webhttp />         </behavior>       </endpointbehaviors>      </behaviors>      <standardendpoints>       <webhttpendpoint>         <standardendpoint name="" helpenabled="true" automaticformatselectionenabled="false" defaultoutgoingresponseformat="json" maxreceivedmessagesize="2147483647"                            maxbuffersize="2147483647"                               maxbufferpoolsize="4194304"                           transfermode="buffered"  />       </webhttpendpoint>     </standardendpoints>      <servicehostingenvironment aspnetcompatibilityenabled="true" multiplesitebindingsenabled="true" />      <bindings>       <webhttpbinding>         <binding           maxbufferpoolsize="2147483647"           maxreceivedmessagesize="2147483647"           maxbuffersize="2147483647" transfermode="streamed">         </binding>       </webhttpbinding>     </bindings>    </system.servicemodel>    <system.webserver>     <modules runallmanagedmodulesforallrequests="true" />     <directorybrowse enabled="true" />   </system.webserver>    <connectionstrings>   ....   </connectionstrings>   <entityframework>     <defaultconnectionfactory type="system.data.entity.infrastructure.sqlconnectionfactory, entityframework" />     <providers>       <provider invariantname="system.data.sqlclient" type="system.data.entity.sqlserver.sqlproviderservices, entityframework.sqlserver" />     </providers>   </entityframework> </configuration>