Unknow authentication strategy "login"

[talented-vicky]

Error: Unknown authentication strategy "login"
at attempt (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\passport\lib\middleware\authenticate.js:193:39)
at authenticate (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\passport\lib\middleware\authenticate.js:370:7)
at exports.postSignIn (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\controllers\auth.js:47:6)
at Layer.handle [as handle_request] (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\route.js:144:13)
at Route.dispatch (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\route.js:114:3)
at Layer.handle [as handle_request] (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\layer.js:95:5)
at C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\index.js:284:15
at Function.process_params (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\index.js:346:12)
at next (C:\Users\HP\Documents\personal\AltSchool\nodejs\blogging api\node_modules\express\lib\router\index.js:280:10)

[talented-vicky]

Please kindly help with this, I dunno what to do next, I've checked through my code, but still doesn't seem to understand what's decode what is wrong

[EvanHahn]

Could you post a sample code snippet that reproduces the problem?

My guess: my book uses an old version of Passport.