Azure Function Error

Question

Azure Function Error

Nyong, ChinVenn 20

Anyone has faced this error before? I have tested with different python version, but the error still persists. Seems like oryx issue here

Error: Oops... An unexpected error has occurred.\nError: System.ArgumentNullException: Value cannot be null. (Parameter 'node')\n at System.ArgumentNullException.Throw(String paramName)\n at System.ArgumentNullException.ThrowIfNull(Object argument, String paramName)\n at System.Xml.XPath.Extensions.XPathSelectElements(XNode node, String expression, IXmlNamespaceResolver resolver)\n at Microsoft.Oryx.BuildScriptGenerator.SdkStorageVersionProviderBase.GetAvailableVersionsFromStorage(String platformName) in /__w/1/s/Oryx/src/BuildScriptGenerator/SdkStorageVersionProviderBase.cs:line 77\n at Microsoft.Oryx.BuildScriptGenerator.Python.PythonSdkStorageVersionProvider.GetVersionInfo() in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/VersionProviders/PythonSdkStorageVersionProvider.cs:line 25\n at Microsoft.Oryx.BuildScriptGenerator.Python.PythonVersionProvider.GetVersionInfo() in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/VersionProviders/PythonVersionProvider.cs:line 53\n at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.get_SupportedVersions() in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 130\n at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.GetMaxSatisfyingVersionAndVerify(String version) in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 673\n at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.ResolveVersions(RepositoryContext context, PlatformDetectorResult detectorResult) in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 442\n at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.Detect(RepositoryContext context) in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 148\n at Microsoft.Oryx.BuildScriptGenerator.DefaultPlatformsInformationProvider.GetPlatformsInfo(RepositoryContext context) in /__w/1/s/Oryx/src/BuildScriptGenerator/DefaultPlatformsInformationProvider.cs:line 65\n at Microsoft.Oryx.BuildScriptGenerator.DefaultBuildScriptGenerator.GenerateBashScript(BuildScriptGeneratorContext context, String& script, List1 checkerMessageSink) in /__w/1/s/Oryx/src/BuildScriptGenerator/DefaultBuildScriptGenerator.cs:line 75\n at Microsoft.Oryx.BuildScriptGeneratorCli.BuildScriptGenerator.TryGenerateScript(String& generatedScript, Exception& exception) in /__w/1/s/Oryx/src/BuildScriptGeneratorCli/BuildScriptGenerator.cs:line 63\n at Microsoft.Oryx.BuildScriptGeneratorCli.BuildCommand.Execute(IServiceProvider serviceProvider, IConsole console) in /__w/1/s/Oryx/src/BuildScriptGeneratorCli/Commands/BuildCommand.cs:line 278\n at Microsoft.Oryx.BuildScriptGeneratorCli.CommandBase.OnExecute(IConsole console) in /__w/1/s/Oryx/src/BuildScriptGeneratorCli/Commands/CommandBase.cs:line 87\n/opt/Kudu/Scripts/starter.sh oryx build /tmp/zipdeploy/extracted -o /home/site/wwwroot --platform python --platform-version 3.11.8 -p packagedir=.python_packages/lib/site-packages More information: Error: Oops... An unexpected error has occurred. Error: System.ArgumentNullException: Value cannot be null. (Parameter 'node') at System.ArgumentNullException.Throw(String paramName) at System.ArgumentNullException.ThrowIfNull(Object argument, String paramName) at System.Xml.XPath.Extensions.XPathSelectElements(XNode node, String expression, IXmlNamespaceResolver resolver) at Microsoft.Oryx.BuildScriptGenerator.SdkStorageVersionProviderBase.GetAvailableVersionsFromStorage(String platformName) in /__w/1/s/Oryx/src/BuildScriptGenerator/SdkStorageVersionProviderBase.cs:line 77 at Microsoft.Oryx.BuildScriptGenerator.Python.PythonSdkStorageVersionProvider.GetVersionInfo() in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/VersionProviders/PythonSdkStorageVersionProvider.cs:line 25 at Microsoft.Oryx.BuildScriptGenerator.Python.PythonVersionProvider.GetVersionInfo() in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/VersionProviders/PythonVersionProvider.cs:line 53 at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.get_SupportedVersions() in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 130 at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.GetMaxSatisfyingVersionAndVerify(String version) in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 673 at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.ResolveVersions(RepositoryContext context, PlatformDetectorResult detectorResult) in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 442 at Microsoft.Oryx.BuildScriptGenerator.Python.PythonPlatform.Detect(RepositoryContext context) in /__w/1/s/Oryx/src/BuildScriptGenerator/Python/PythonPlatform.cs:line 148 at Microsoft.Oryx.BuildScriptGenerator.DefaultPlatformsInformationProvider.GetPlatformsInfo(RepositoryContext context) in /__w/1/s/Oryx/src/BuildScriptGenerator/DefaultPlatformsInformationProvider.cs:line 65 at Microsoft.Oryx.BuildScriptGenerator.DefaultBuildScriptGenerator.GenerateBashScript(BuildScriptGeneratorContext context, String& script, List1 checkerMessageSink) in /__w/1/s/Oryx/src/BuildScriptGenerator/DefaultBuildScriptGenerator.cs:line 75 at Microsoft.Oryx.BuildScriptGeneratorCli.BuildScriptGenerator.TryGenerateScript(String& generatedScript, Exception& exception) in /__w/1/s/Oryx/src/BuildScriptGeneratorCli/BuildScriptGenerator.cs:line 63 at Microsoft.Oryx.BuildScriptGeneratorCli.BuildCommand.Execute(IServiceProvider serviceProvider, IConsole console) in /__w/1/s/Oryx/src/BuildScriptGeneratorCli/Commands/BuildCommand.cs:line 278 at Microsoft.Oryx.BuildScriptGeneratorCli.CommandBase.OnExecute(IConsole console) in /__w/1/s/Oryx/src/BuildScriptGeneratorCli/Commands/CommandBase.cs:line 87

Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T09:37:16.64+00:00
Hi Nyong, ChinVenn,

How are you deploying the function?

The error occurs because Oryx can’t read Python SDK metadata which could be missing.

It often happens due to an unsupported or unavailable Python version like 3.11.8. Remove explicit version or downgrade the python version.

Run oryx platforms to check supported versions and use one that’s listed.

Force a clean Oryx build Remove any cached build layers or corrupted extracted files and redeploy the function.
rm -rf /home/site/wwwroot/* rm -rf /tmp/zipdeploy/extracted/*

Ensure your App Service or custom container uses the latest Oryx build image.
Nyong, ChinVenn 20 Reputation points

2025-10-23T09:48:35.5666667+00:00

Hi, I'm trying to deploy my Azure Function App using the command func azure functionapp publish fncorpfinancedev001 --build remote.

I’ve attempted both local and remote builds. The local build fails because the arabica_client (company library) dependency requires native or binary wheels, which are not compatible with my local environment.

The remote build, which uses Oryx on the SCM site, also fails—even when I try different Python versions such as 3.12.10, 3.11.8, and 3.10. The error persists regardless of the version. Is there a specific Python version officially supported by Oryx that works with such dependencies? It’s strange that even deploying a template function app results in the same error.

Thanks for your help!
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T09:56:41.71+00:00
Nyong, ChinVenn,

Check arabica_client for what Python versions and OS wheels it publishes. Suppose it only has wheels for cp310 and cp39. Then use Python 3.10 that maps to cp310 in Azure Function remote build.

In your Azure Function project’s requirements.txt, pin arabica_client==specific_version and check wheel availability manually.

Deploy the function with remote build using --build remote and ensure your Function App’s runtime version is set to 3.10.
Nyong, ChinVenn 20 Reputation points

2025-10-23T10:28:05.1566667+00:00

If we do not care about the dependencies and are only testing with an auto-generated template, but the error still persists during deployment, can we confirm that it is a Python version issue?
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T10:40:58.4333333+00:00

Did you check if you are getting the same error when you deploy a simple Python function without any external libraries?
Nyong, ChinVenn 20 Reputation points

2025-10-23T10:41:47.0933333+00:00

yes, totally same error
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T10:46:42.2+00:00

Can you please add SCM_DO_BUILD_DURING_DEPLOYMENT= true application setting in the function app and deploy again?
Nyong, ChinVenn 20 Reputation points

2025-10-23T13:01:00.9+00:00

hiii it showed this
[Kudu-ValidationStep] starting.

Following app settings are not supported with this SKU: SCM_DO_BUILD_DURING_DEPLOYMENT

InvalidAppSettingsException: The app settings SCM_DO_BUILD_DURING_DEPLOYMENT are not supported with this SKU. Please remove the listed app settings and then redeploy

is it because i am using the flex consumption package?
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T13:04:58.1533333+00:00

Yes, this setting SCM_DO_BUILD_DURING_DEPLOYMENT is not supported in flex consumption plan. Please allow me some time, I will check from my end and revert back in some time. Thanks for your patience and time.

Answer accepted by question author

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Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T09:37:16.64+00:00

Hi Nyong, ChinVenn,

How are you deploying the function?

The error occurs because Oryx can’t read Python SDK metadata which could be missing.

It often happens due to an unsupported or unavailable Python version like 3.11.8. Remove explicit version or downgrade the python version.

Run oryx platforms to check supported versions and use one that’s listed.

Force a clean Oryx build Remove any cached build layers or corrupted extracted files and redeploy the function.
rm -rf /home/site/wwwroot/* rm -rf /tmp/zipdeploy/extracted/*

Ensure your App Service or custom container uses the latest Oryx build image.
Nyong, ChinVenn 20 Reputation points

2025-10-23T09:48:35.5666667+00:00

Hi, I'm trying to deploy my Azure Function App using the command func azure functionapp publish fncorpfinancedev001 --build remote.

I’ve attempted both local and remote builds. The local build fails because the arabica_client (company library) dependency requires native or binary wheels, which are not compatible with my local environment.

The remote build, which uses Oryx on the SCM site, also fails—even when I try different Python versions such as 3.12.10, 3.11.8, and 3.10. The error persists regardless of the version. Is there a specific Python version officially supported by Oryx that works with such dependencies? It’s strange that even deploying a template function app results in the same error.

Thanks for your help!
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T09:56:41.71+00:00

Nyong, ChinVenn,

Check arabica_client for what Python versions and OS wheels it publishes. Suppose it only has wheels for cp310 and cp39. Then use Python 3.10 that maps to cp310 in Azure Function remote build.

In your Azure Function project’s requirements.txt, pin arabica_client==specific_version and check wheel availability manually.

Deploy the function with remote build using --build remote and ensure your Function App’s runtime version is set to 3.10.
Nyong, ChinVenn 20 Reputation points

2025-10-23T10:28:05.1566667+00:00

If we do not care about the dependencies and are only testing with an auto-generated template, but the error still persists during deployment, can we confirm that it is a Python version issue?
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T10:40:58.4333333+00:00

Did you check if you are getting the same error when you deploy a simple Python function without any external libraries?
Nyong, ChinVenn 20 Reputation points

2025-10-23T10:41:47.0933333+00:00

yes, totally same error
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T10:46:42.2+00:00

Can you please add SCM_DO_BUILD_DURING_DEPLOYMENT= true application setting in the function app and deploy again?
Nyong, ChinVenn 20 Reputation points

2025-10-23T13:01:00.9+00:00

hiii it showed this
[Kudu-ValidationStep] starting.

Following app settings are not supported with this SKU: SCM_DO_BUILD_DURING_DEPLOYMENT

InvalidAppSettingsException: The app settings SCM_DO_BUILD_DURING_DEPLOYMENT are not supported with this SKU. Please remove the listed app settings and then redeploy

is it because i am using the flex consumption package?
Pravallika KV 17,025 Reputation points Microsoft External Staff Moderator

2025-10-23T13:04:58.1533333+00:00

Yes, this setting SCM_DO_BUILD_DURING_DEPLOYMENT is not supported in flex consumption plan. Please allow me some time, I will check from my end and revert back in some time. Thanks for your patience and time.

Answer 1

Hi Nyong, ChinVenn,

Glad to know that your issue is resolved.

I am summarizing and posting the discussion as an answer below.

The issue occurred because the virtual network used a private IP, preventing direct outbound access to public endpoints such as APIs, NuGet, or Azure service URLs. Since those URLs weren’t reachable, deployment and connectivity operations failed.

To resolve the connectivity issue, a proxy configuration was added to route outbound traffic from the private network to the public networks. After setting up the proxy, the Function App was able to reach the required URLs, and able to deploy the function successfully.

Hope it helps!

Please do not forget to click "Accept the answer” and Yes, this can be beneficial to other community members.

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If you have any other questions, let me know in the "comments" and I would be happy to help you.

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Azure Function Error

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