问自己部署node.js的wafer2 demo不成功？

按照官网的步骤到最后一步运行 node app.js时报错，如下：

/data/release/weapp/node_modules/wafer-node-sdk/index.js:48

if ([rootPathname, useQcloudLogin, cos, serverHost, tunnelServerUrl, tunnelSignatureKey, qcloudAppId, qcloudSecretId, qcloudSecretKey, wxMessageToken].some(v => v === undefined)) throw new Error(ERRORS.ERR_INIT_SDK_LOST_CONFIG)

Error: ERR_INIT_SDK_LOST_CONFIG

at init (/data/release/weapp/node_modules/wafer-node-sdk/index.js:48:190)

at Object.<anonymous> (/data/release/weapp/qcloud.js:36:18)

at Module._compile (module.js:652:30)

at Object.Module._extensions..js (module.js:663:10)

at Module.load (module.js:565:32)

at tryModuleLoad (module.js:505:12)

at Function.Module._load (module.js:497:3)

at Module.require (module.js:596:17)

at require (internal/module.js:11:18)

at Object.<anonymous> (/data/release/weapp/controllers/message.js:1:103)

在weapp文件夹下也没有自动下发sdk.config.json, 是什么原因？如何改正？谢谢