１．errorの原因
functionにawaitを付け忘れると出る

２．errorの条件
・呼び出しfunctionのreturn値が配列
かつ
・呼び出しfunction をasyncで定義している

３．理由
its return value is not iterable.

４．errorの例

# npm run dev:supply

> privateinvoice@0.0.1 dev:supply
> npx dotenv -e .supply.env node index.js

--- Starting HTTP Server ---
Private Invoice is using database: SupplierServer_265
Private Invoice is listening on Port: 3000
/confirm Time: 174 ms
code=false
/opt/PrivateInvoice/282/routes/wallet.js:179
        const [status6, data6] = _getSupplierAccount(supplier_host, document_uuid, user_uuid) ;
                                 ^

TypeError: _getSupplierAccount is not a function or its return value is not iterable
    at /opt/PrivateInvoice/282/routes/wallet.js:179:27
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

Node.js v17.8.0
#