How to resolve "An unhandled error has occurred. Reload 🗙" in Blazor application?

Hassan Raza Khan 20 Reputation points

I am encountering this error consistently while executing my Blazor file. I reinstalled Visual Studio in case of missing files, but it did not work. I also tried creating Blazor files both from CLI and VS, but the error persists.

Screenshot 2024-05-24 103512

A free and open-source web framework that enables developers to create web apps using C# and HTML being developed by Microsoft.
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Visual Studio
Visual Studio
A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.
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Accepted answer
  1. JasonPan - MSFT 4,706 Reputation points Microsoft Vendor

    Hi @Hassan Raza Khan,

    After testing, the issue is related to the project name, you are using Sample Blazor App and issue occurs. If using SampleBlazorApp, it will works fine.


    In App.razor file, we can find it will use this line, then the url will be https://localhost:7298/Sample%20Blazor%20App.styles.css.

    If there are no special characters (spaces) when naming, you will not encounter this problem.

    <link rel="stylesheet" href="Sample Blazor App.styles.css" />

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    Best regards,


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