Question 305053 in ASP.NET Question posted in
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Asp.net – No relevant source lines – Source file could not be opened ('Unspecified error ')

I am running a 32-bit ASP.NET application using .NET Framework 4.8. I am getting the following error when starting the application:

error CS1504: Source file 'c:WindowsMicrosoft.NETFrameworkv4.0.30319Temporary ASP.NET Files...xxx.cs' could not be opened ('Unspecified error ')

What I have tried

  • Running the application in IISExpress and Local IIS both in 32-bit mode.
  • Updating Visual Studio
  • Rebooting
  • Reinstalling Visual Studio 2022 and .NET Framework 4.8
  • Move the location of the temporary files folder to a different location using configuration
  • Remove the Temp folder/files / clean / rebuild
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2

Answers


  1. Chosen as BEST ANSWER
    0

    I found out what the issue was. There were language features that needed to be installed through Visual Studio 2022.

    Go to Build => ASP.NET Compilation => Enable latest C# and VB language features

    enter image description here


  2. 0

    Try –
    Delete the ‘Temporary ASP.NET Files’ folder. Restart your computer, clean the solution and rebuild the solution

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