c# - Can Not Use Twitter Authentication -

i implement authentication twitter asp.net mvc.

app.usetwitterauthentication(new twitterauthenticationoptions() {        consumerkey = "xxx",        consumersecret = "xxx", }); 

when clicked link http://localhost:55586/account/login?returnurl=%2f met error below image: don't know missed somethings or not. []

thank you, everyone. finally, found solution.

step 1:

app.usetwitterauthentication(new twitterauthenticationoptions() {     consumerkey = "xxx",     consumersecret = "xxx",     backchannelcertificatevalidator = new microsoft.owin.security.certificatesubjectkeyidentifiervalidator(new[]     {        "a5ef0b11cec04103a34a659048b21ce0572d7d47", // verisign class 3 secure server ca - g2        "0d445c165344c1827e1d20ab25f40163d8be79a5", // verisign class 3 secure server ca - g3        "7fd365a7c2ddecbbf03009f34339fa02af333133", // verisign class 3 public primary certification authority - g5        "39a55d933676616e73a761dfa16a7e59cde66fad", // symantec class 3 secure server ca - g4        "‎add53f6680fe66e383cbac3e60922e3b4c412bed", // symantec class 3 ev ssl ca - g3        "4eb6d578499b1ccf5f581ead56be3d9b6744a5e5", // verisign class 3 primary ca - g5        "5168ff90af0207753cccd9656462a212b859723b", // digicert sha2 high assurance server c‎a         "b13ec36903f8bf4701d498261a0802ef63642bc3" // digicert high assurance ev root ca      }), }); 

run project again. met error below:

step 2:

https://apps.twitter.com/
go settings tab set callback url website. if not real

=> set http://google.com

then, works me. don't know why need set callback url. after set value it, cannot set empty value. so, think it's error of twitter api.

asp-net-mvc-5-owin-twitter-auth-throwing-401-exception