nodemon app crashed waiting for file changes before starting

`TypeError: JwtStrategy requires a secret or key
at new JwtStrategy (/home/ab/Desktop/express-login-register-api-master/node_modules/passport-jwt/lib/strategy.js:45:15)

at Object.<anonymous> (/home/ab/Desktop/express-login-register-api-master/src/auth/passport.js:8:3)

at Module._compile (node:internal/modules/cjs/loader:1099:14)

at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)

at Module.load (node:internal/modules/cjs/loader:975:32)

at Function.Module._load (node:internal/modules/cjs/loader:822:12)

at Module.require (node:internal/modules/cjs/loader:999:19)

at require (node:internal/modules/cjs/helpers:102:18)

at Object.<anonymous> (/home/ab/Desktop/express-login-register-api-master/src/app.js:7:1)

at Module._compile (node:internal/modules/cjs/loader:1099:14)

Node.js v17.7.2
[nodemon] app crashed – waiting for file changes before starting…

I was trying to load an external API from github and trying to run it in my code.`