'Errors after creating new Azure Function app in .NET 6

After creating a new Azure Function app running on .NET6 project in Visual Studio 2022, I'm getting errors (I I didn't change anything in the newly created project):

The type or namespace name 'actionresult' could not be found

My .csproj file:

csproj-file

I tried repairing visual studio 2022. I have the same issue if I create a function app in .NET5, .NET3. If someone also had this issue it would be great. Thank you.



Solution 1:[1]

Ok I'm found the solution. Deleting all folders and files from:

C:\Users\User_name\.nuget\packages

solved the issue.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Racki Kamil