[SOLVED] Error in Azure Storage Explorer with Azurite : The first argument must be of type string or an instance of Buffer

Error in Azure Storage Explorer with Azurite : The first argument must be of type string or an instance of Buffer

I'm running an Azure function locally, from VSCode, that outputs a string to a blob. I'm using Azurite to emulate the output blob container. My function looks like this:

import azure.functions as func

def main(mytimer: func.TimerRequest, outputblob:func.Out[str]):
    outputblob.set("hello")

My function.json:

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "mytimer",
      "type": "timerTrigger",
      "direction": "in",
      "schedule": "0 * * * * *"
    },
    {
      "name": "outputblob",
      "type": "blob",
      "dataType": "string",
      "direction": "out",
      "path": "testblob/hello"
    }
  ]
}

In local.settings.json, I've set "AzureWebJobsStorage": "UseDevelopmentStorage=true".

The problem is, when I run the function and check in Azure Storage Explorer, the container is created (testblob) (along with 2 other containers: azure-webjobs-hosts and azure-webjobs-secrets) but it is empty and Azure Storage Explorer displays an error message when I refresh : The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object.Received undefined

The function runs and doesn't return any error message.

When I use a queue instead of a blob as output, it works and I can see the string in the emulated queue storage.

When I use the blob storage in my Azure subscription instead of the emulated blob, it works as well, a new blob is created with the string.

I've tried the following:

clean and restart Azurite several times
replace "UseDevelopmentStorage=true" by the connection string of the emulated storage
reinstall Azure Storage Explorer

I keep getting the same error message.

I'm using Azure Storage Explorer Version 1.25.0 on Windows 11.

Thanks for any help!

Solution