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- 当前 Bug 的表现（可附上截图） - 预期表现 - 复现路径 - 提供一个最简复现 Demo 按照 巧借 [ 小程序云开发 ] 快速接入微信支付功能文进行接入 npm i --product [图片] 设定好用户id、key等参数后，接下单，出现以下错误 WAService.js:1 Uncaught (in promise) Error: errCode: -404011 cloud function execution error | errMsg: cloud.callFunction:fail requestID c077ad8b-99a8-11e9-b5ec-525400b2c41b, cloud function service error code -504002, error message Cannot read property 'length' of undefined; at cloud.callFunction api;      at new u (WAService.js:1)     at d (WAService.js:1)     at Object.t.returnAsFinalCloudSDKError (WAService.js:1)     at Function.success (WAService.js:1)     at WAService.js:1     at C (WAService.js:1)     at i.<anonymous> (WAService.js:1)     at i.emit (WAService.js:1)     at hc (WAService.js:1)     at WAService.js:1 请问什么原因？