解决方法：云函数的返回值不要返回result，直接返回result.errCode，就不会报错。

这个问题我当时遇到的情况是完成发送订阅消息后return（result），就会报出这个错误，后来我注释掉return（result）就不报错了，不知道什么原因。

这种如何解决呢？

Error: cloud.callFunction:fail Error: errCode: -504002 functions execute fail | errMsg: Runtime.ImportModuleError: Error: Cannot find module 'wx-server-sdk'

Require stack:

- /var/user/index.js

- /var/runtime/node16/UserFunction.js

- /var/runtime/node16/Runtime.engine.js

- /var/runtime/node16/bootstrap.js

    at Object.module.exports.load (/var/runtime/node16/UserFunction.js:34:13)

    at Runtime.handleOnce (/var/runtime/node16/Runtime.engine.js:85:38)

    at Timeout._onTimeout (/var/runtime/node16/Runtime.engine.js:54:12)

    at listOnTimeout (node:internal/timers:557:17)

    at processTimers (node:internal/timers:500:7) (callId: 1715271882467-0.7034750134270631) (trace: 0:24:42 start->0:24:43 system error (Error: errCode: -504002 functions execute fail | errMsg: Runtime.ImportModuleError: Error: Cannot find module 'wx-server-sdk'

Require stack:

- /var/user/index.js

- /var/runtime/node16/UserFunction.js

- /var/runtime/node16/Runtime.engine.js

- /var/runtime/node16/bootstrap.js

    at Object.module.exports.load (/var/runtime/node16/UserFunction.js:34:13)

    at Runtime.handleOnce (/var/runtime/node16/Runtime.engine.js:85:38)

    at Timeout._onTimeout (/var/runtime/node16/Runtime.engine.js:54:12)

    at listOnTimeout (node:internal/timers:557:17)

    at processTimers (node:internal/timers:500:7)), abort)

    at R (<anonymous>:1:245532)

    at <anonymous>:1:279958(env: Windows,mp,1.06.2402040; lib: 3.4.3)

相同问题 +1，本地调试发现 result 里面的 msgid 竟然是个 BigInt 类型（似乎这个问题也会导致本地调试云函数一直无法 response）

我的解决方法：将 msgid 转成 string 进行返回

（这里是个 demo 所以没有做 msgid 是否为空判断，有需要可以自己处理）

再补一张 toString 以后的图

感谢楼主，已被坑了一天了

get openid fail Error: cloud.callFunction:fail Error: errCode: -504002 functions execute fail | errMsg: ReferenceError: wx is not defined

    at Object.<anonymous> (:12168/var/user/index.js:3)

    at Module._compile (:12168/appservice/internal/modules/cjs/loader.js:1158)

    at Object.Module._extensions..js (:12168/appservice/internal/modules/cjs/loader.js:1178)

    at Module.load (:12168/appservice/internal/modules/cjs/loader.js:1002)

    at Function.Module._load (:12168/appservice/internal/modules/cjs/loader.js:901)

    at Module.require (:12168/appservice/internal/modules/cjs/loader.js:1044)

    at require (:12168/appservice/internal/modules/cjs/helpers.js:77)

    at Object.module.exports.load (:12168/var/runtime/node12/UserFunction.js:26)

    at Runtime.handleOnce (:12168/var/runtime/node12/Runtime.engine.js:99)

    at Timeout._onTimeout (:12168/var/runtime/node12/Runtime.engine.js:56) (callId: 1659562043691-0.015394991480191855) (trace: 5:27:23 start->5:27:23 app show->5:27:24 system error (Error: errCode: -504002 functions execute fail | errMsg: ReferenceError: wx is not defined

    at Object.<anonymous> (:12168/var/user/index.js:3)

    at Module._compile (:12168/appservice/internal/modules/cjs/loader.js:1158)

    at Object.Module._extensions..js (:12168/appservice/internal/modules/cjs/loader.js:1178)

    at Module.load (:12168/appservice/internal/modules/cjs/loader.js:1002)

    at Function.Module._load (:12168/appservice/internal/modules/cjs/loader.js:901)

    at Module.require (:12168/appservice/internal/modules/cjs/loader.js:1044)

    at require (:12168/appservice/internal/modules/cjs/helpers.js:77)

    at Object.module.exports.load (:12168/var/runtime/node12/UserFunction.js:26)

    at Runtime.handleOnce (:12168/var/runtime/node12/Runtime.engine.js:99)

    at Timeout._onTimeout (:12168/var/runtime/node12/Runtime.engine.js:56)), abort)

    at S (WASubContext.js?t=wechat&s=1659560544268&v=2.24.1:2)

    at WASubContext.js?t=wechat&s=1659560544268&v=2.24.1:2

    at WASubContext.js?t=wechat&s=1659560544268&v=2.24.1:2

    at n (WASubContext.js?t=wechat&s=1659560544268&v=2.24.1:2)

突然间出现这个问题，云函数不能使用了，是什么原因呢？

等一个解决方案

我也遇到了 该怎么解决啊

今天我也碰到了，应该是官方BUG，不知什么时候解决？

能成功发送，但是会报错，请问怎么解决

 Error: cloud.callFunction:fail Error: errCode: -504002 functions execute fail | errMsg: TypeError: Do not know how to serialize a BigInt

    at JSON.stringify (<anonymous>)

    at callback (:20269/var/runtime/node12/CallbackContext.js:31)

    at :20269/var/runtime/node12/CallbackContext.js:81

    at :20269/var/runtime/node12/Runtime.engine.js:237

    at processTicksAndRejections (:20269/appservice/internal/process/task_queues.js:97) (callId: 1648270421746-0.8908816914399289) (trace: 12:53:41 start->12:53:42 system error (Error: errCode: -504002 functions execute fail | errMsg: TypeError: Do not know how to serialize a BigInt

    at JSON.stringify (<anonymous>)

    at callback (:20269/var/runtime/node12/CallbackContext.js:31)

    at :20269/var/runtime/node12/CallbackContext.js:81

    at :20269/var/runtime/node12/Runtime.engine.js:237

    at processTicksAndRejections (:20269/appservice/internal/process/task_queues.js:97)), abort)

    at on (WASubContext.js?t=wechat&s=1648259951586&v=2.19.4:2)

    at WASubContext.js?t=wechat&s=1648259951586&v=2.19.4:2

    at WASubContext.js?t=wechat&s=1648259951586&v=2.19.4:2

    at o (WASubContext.js?t=wechat&s=1648259951586&v=2.19.4:2)