System.Private.CoreLib: Result: Failure Value cannot be null. (Parameter 'value')

[carct]

System.Private.CoreLib: Result: Failure Exception: Value cannot be null. (Parameter 'value')

above error is thrown in local-dev runtime environment when calling the HttpTrigger with POST and JSON-format payload on a PowerShell AzFunctionApp-v3 NB: error is thrown before any code is executed for validation i left in my run.ps1 just the following lines (commenting all the rest) and error was still thrown:

using namespace System.Net
param($Request, $TriggerMetadata)

azure-functions-core-tools installation: npm i -g azure-functions-core-tools@3 --unsafe-perm true which translated to version 3.0.2534

fix = downgrade to 3.0.2245: npm i -g azure-functions-core-tools@3.0.2245 --unsafe-perm true

configuration files + other environment tools & versions

function.json

{
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "name": "Request",
      "methods": [
        "get",
        "post"
      ]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "Response"
    }
  ]
}

.vscode/settings.json

{
    "azureFunctions.deploySubpath": ".",
    "azureFunctions.projectLanguage": "PowerShell",
    "azureFunctions.projectRuntime": "~3",
    "azureFunctions.showExplorer": true,
    "azureFunctions.stopFuncTaskPostDebug": false,
    "azureFunctions.validateFuncCoreTools": true,
    "debug.internalConsoleOptions": "openOnSessionStart",
    "debug.allowBreakpointsEverywhere": true,
    "debug.extensionHost.useV3": true,
    "powershell.powerShellDefaultVersion": "~7",
    "terminal.integrated.shell.windows": "C:\\Program Files\\PowerShell\\7\\pwsh.exe"
}

host.json

{
  "version": "2.0",
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[1.*, 2.0.0)"
  },
  "managedDependency": {
    "enabled": true
  },
  "extensions": {
      "http": {
          "routePrefix": ""
      }
  }
}

VSCode 1.46.0 MS PowerShell VSCode Extension v2020.6.0 =====> PowerShell Integrated Console v2020.6.0 <=====

PSVersion                      7.0.2
PSEdition                      Core

[carct]

fix = downgrade to 3.0.2245 scenario:

function loads in runtime, successfully serves request and processes payload, make a change to code, save, function runtime reloads everything, send again a request and same error turns up CTRL+C to close the runtime, rerun with F5 without changing anything everything works, but some other times i need reset (click on Kill Terminal) for both =====> PowerShell Integrated Console v2020.6.0 <===== and Task > Executing task: func start --script-root src < once i do this it seems to work everytime

[carct]

btw, the --watch flag from the func CLI does not influence behavior what-so-ever

[anthonychu]

@AnatoliB @Francisco-Gamino Can you please take a look to see what this problem might be? Thanks.

[AnatoliB]

@carct Do you have any code in the profile.ps1 file in the root of your app? Does the issue repro if you remove or comment out all the code there?

[carct]

@AnatoliB i have a line for loading modules but behavior is consistent with or without that line

[AnatoliB]

@carct I was unable to repro this on a simple app. If possible, could you please share:

• the entire app content;
• the POST request;
• the entire func start log.