Getting "Internal Error running a block: Error: An internal server error occurred" error

💬 Workflows
1

I am trying to create my first workflow. We have dozens of apps and about 20 resources working in production. I am using an existing SQL resource but no matter the query I always get back the error:
{"data":null,"metadata":{},"error":"Internal Error running a block: Error: An internal server error occurred"}

I have seen this error reported a few times in different posts, but none of the suggestions fix my issue or are on the version I am on.
Retool Self-hosted
Version 3.114.10
Business Plan

Any advice?

Thanks in advance,
Steve

3

Hi @steve_melzer,

Apologies for the issue. Can you share a screenshot of the query? Or are you getting this error when testing the resource connection?

This is a not super descriptive error which is unfortunate. Are you able to check your workflow container logs to see if there is more details there on this issue?

4

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5

Jack,
More details...
We are running Retool self-hosted. We are running on AWS. Here are the logs from the AWS console:


{
    "level": "info",
    "message": {
        "http": {
            "method": "POST",
            "url_base": "[retool.relaypayments.io](http://retool.relaypayments.io)",
            "url_path": "/api/workflow/a52f7646-0951-4382-a927-bca773acced2/runBlock?origin=frontend"
        },
        "type": "REQUEST_BEGIN"
    },
    "pid": 158,
    "requestId": "84d05587-e374-4329-a97c-c98cb4480683",
    "startTime": 1332562641.439335,
    "timestamp": "2025-08-07T17:26:20.403Z"
}
{
    "jobId": "44760709-2dcf-435d-bd73-7c578a105964",
    "level": "info",
    "message": "Running the block",
    "pid": 158,
    "requestId": "84d05587-e374-4329-a97c-c98cb4480683",
    "sequelizeCount": 12,
    "startTime": 1332562641.439335,
    "timestamp": "2025-08-07T17:26:20.439Z"
}
{
    "blockUuid": "d4025909-380b-4099-89f2-9c53bf303b95",
    "level": "info",
    "message": "Running workflow block",
    "timestamp": "2025-08-07T17:26:21.071Z",
    "workflowId": "a52f7646-0951-4382-a927-bca773acced2",
    "isSandboxLog": true
}
{
    "blockUuid": "d4025909-380b-4099-89f2-9c53bf303b95",
    "level": "info",
    "message": {
        "http": {
            "method": "POST",
            "url_path": "[https://null.undefined/api/workflow/runQueryForSandboxed](https://null.undefined/api/workflow/runQueryForSandboxed)"
        },
        "type": "CLIENT_REQUEST"
    },
    "requestId": "8e2e0283-08f6-4afe-9ab0-431885cce1e1",
    "timestamp": "2025-08-07T17:26:21.089Z",
    "workflowId": "a52f7646-0951-4382-a927-bca773acced2",
    "isSandboxLog": true
}

Notice the URL https://null.undefined/api/workflow/runQueryForSandboxed. I am not sure where this is coming from or what is misconfigured. Any help would be appreciated.

Thanks,
Steve