Nodejs Cloud function error

i created a nodejs cloud function for generating pdf invoice and send via email. im getting the following errors during execution TypeError: userFunction is not a function at execute (/usr/local/server/src/server.js:159:28) at action (/usr/local/server/src/server.js:174:33) at processTicksAndRejections (node:internal/process/task_queues:96:5) at async /usr/local/server/src/server.js:10:9
and
Multiple internal curl errors has occurred within the executor! Error Number: 111. Error Msg: Connection refused\nError Code: 500

What's the code for the function?
Remember censoring sensitive content if ther's

And what's your SDK version and the Appwrite self-hosted version?

1.4.8

i got the build logs ```Preparing for build ...
Building ...
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE package: '@puppeteer/browsers@2.2.0',
npm WARN EBADENGINE required: { node: '>=18' },
npm WARN EBADENGINE current: { node: 'v16.16.0', npm: '8.11.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE package: 'puppeteer@22.6.1',
npm WARN EBADENGINE required: { node: '>=18' },
npm WARN EBADENGINE current: { node: 'v16.16.0', npm: '8.11.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE package: 'puppeteer-core@22.6.1',
npm WARN EBADENGINE required: { node: '>=18' },
npm WARN EBADENGINE current: { node: 'v16.16.0', npm: '8.11.0' }
npm WARN EBADENGINE }

removed 24 packages, and audited 210 packages in 7s

23 packages are looking for funding
run npm fund for details

2 moderate severity vulnerabilities

To address all issues (including breaking changes), run:
npm audit fix --force

Run npm audit for details.
Packing build ...
Build finished.```

do i have to lower the version of pupeteer to work on node 16?