c# - WebApi OAuth UseOAuthBearerAuthentication gives "Sequence contains more than one element" error -


i configured webapi oauth 2.0 these lines:

    app.useoauthbearerauthentication(new oauthbearerauthenticationoptions     {         provider = new oauthbearerauthenticationprovider(),     });      app.useoauthbearertokens(oauthoptions);

but gives me following error @ each request : 

message : error has occurred. exceptionmessage : sequence contains more 1 element exceptiontype : system.invalidoperationexception stacktrace :    @ system.linq.enumerable.singleordefault[tsource](ienumerable`1 source)    @ microsoft.owin.security.authenticationmanager.d__8.movenext() --- end of stack trace previous location exception thrown ---    @ system.runtime.compilerservices.taskawaiter.throwfornonsuccess(task task)    @ system.runtime.compilerservices.taskawaiter.handlenonsuccessanddebuggernotification(task task)    @ system.runtime.compilerservices.taskawaiter`1.getresult()    @ system.web.http.hostauthenticationfilter.d__0.movenext() --- end of stack trace previous location exception thrown ---    @ system.runtime.compilerservices.taskawaiter.throwfornonsuccess(task task)    @ system.runtime.compilerservices.taskawaiter.handlenonsuccessanddebuggernotification(task task)    @ system.web.http.controllers.authenticationfilterresult.d__0.movenext() --- end of stack trace previous location exception thrown ---    @ system.runtime.compilerservices.taskawaiter.throwfornonsuccess(task task)    @ system.runtime.compilerservices.taskawaiter.handlenonsuccessanddebuggernotification(task task)    @ system.runtime.compilerservices.taskawaiter`1.getresult()    @ system.web.http.dispatcher.httpcontrollerdispatcher.d__1.movenext()

my oauthoptions : 

    oauthoptions = new oauthauthorizationserveroptions     {         tokenendpointpath = new pathstring("/token"),         provider = new applicationoauthprovider(publicclientid, usermanagerfactory),         authorizeendpointpath = new pathstring("/account/externallogin"),         accesstokenexpiretimespan = timespan.fromdays(14),         allowinsecurehttp = true,     }; }

if comment useoauthbearerauthentication ok! didn't customize oauthbearerauthenticationprovider yet , use directly why give me error?

it should bug! use

app.useoauthauthorizationserver(oauthoptions);

instead of

app.useoauthbearertokens(oauthoptions);


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