var client = new Chatopera(clientId, secret)错误

[RelaxYeah]

D:\Code Project\chatopera-sample-node\index.js:14
var client = new chatopera(clientId, secret);
^

TypeError: chatopera is not a constructor
at Command.program.version.arguments.action (D:\Code Project\chatopera-sample-node\index.js:14:20)
at Command.listener (D:\Code Project\chatopera-sample-node\node_modules\commander\index.js:315:8)
at Command.emit (events.js:182:13)
at Command.parseArgs (D:\Code Project\chatopera-sample-node\node_modules\commander\index.js:653:12)
at Command.parse (D:\Code Project\chatopera-sample-node\node_modules\commander\index.js:474:21)
at Object. (D:\Code Project\chatopera-sample-node\index.js:38:4)
at Module._compile (internal/modules/cjs/loader.js:688:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
at Module.load (internal/modules/cjs/loader.js:598:32)
at tryModuleLoad (internal/modules/cjs/loader.js:537:12)