Azure Functions
An Azure service that provides an event-driven serverless compute platform.
5,909 questions
Unable to run azure function locally when migrated to .net8
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Abhijit Jadhav (INFOSYS LIMITED)
11
Reputation points Microsoft External Staff
We are trying to migrate azure functions from .net6 to .net8. Post migration we get below error. We get below error in function app console when we run function in local.
"Could not load file or assembly 'Microsoft.Extensions.Configuration, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified."
Function app uses Microsot.Extension.Configuration package.
Even after downgrading this package or other dependent packages we get this error.
Azure Functions
Developer technologies ASP.NET ASP.NET Core
4,815 questions
Developer technologies .NET Other
4,103 questions
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 10%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMM%3C/text%3E%3C/svg%3E)
MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator2023-12-18T15:11:14.4833333+00:00 Abhijit Jadhav (INFOSYS LIMITED) Thanks for posting your question in Microsoft Q&A. Can you share function runtime (also core tools version), project reference (.csproj), full error message including stack trace? If possible, include code snippet, function.json so that it will be helpful in reproducing this issue.
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Abhijit Jadhav (INFOSYS LIMITED) 11 Reputation points Microsoft External Staff
2023-12-18T17:21:16.29+00:00 Error - "Error configuring services in an external startup class. <FunctionName>: Could not load file or assembly 'Microsoft.Extensions.Configuration, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
[2023-12-14T10:13:33.287Z] A host error has occurred during startup operation '892f4ce9-6c45-494d-9897-674ab718b1f0'."
Function version is 4. In Function app local settings FUNCTIONS_WORKER_RUNTIME is tried with 'dotnet' and 'dotnet-isolated' as well.
CSPROJ
Host
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MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator
2023-12-18T20:10:08.0466667+00:00 Abhijit Jadhav (INFOSYS LIMITED) Unable to reproduce this issue at my end with the same packages. Can you share the code snippet, startup.cs along with full error message including stack trace?
I assume this reference
Microsot.Extension.Configurationyou mentioned is part of App Configuration logic? If so, I suggest review doc: Connect to an App Configuration store and add Microsoft.Azure.AppConfiguration.Functions.Worker package to the project and follow the initialization process as described.Also,
Microsoft.Azure.Functions.Extensionsis not needed in isolated model and as per doc: Package references, there should not be any reference to this.Let me know if it helps.
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MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator
2023-12-21T14:09:53.48+00:00 Abhijit Jadhav (INFOSYS LIMITED) Just a follow up to see if the above comment helped with your question. If you still need assistance, let us know.
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Gregory Baranowski 0 Reputation points2024-03-20T14:22:21.36+00:00 I'm having the exact same issue as described above, with exactly same setup. I've found out that cleaning and rebuilding the project fixed this error.
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