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Error After Upgrading the Blazor Project WASM to .Net 8 to .Net 9

Satyasai Gunnam 20 Reputation points
2024-12-24T05:47:54.8166667+00:00

I got this errors While Upgrading my Blazor Web assembly Project to .Net 8 to .Net 9

Error
Message=   Source=   Stack Trace:   at

https://localhost:7123/_framework/dotnet.runtime.o8gq1i8bk6.js:3:96088

This Error  I got in console

MONO_WASM: instantiate_wasm_module() failed TypeError: Cannot read properties of undefined (reading 'promise')

 

Blazor
Blazor
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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  1. JasonPan - MSFT 6,006 Reputation points Microsoft Vendor
    2024-12-24T07:31:11.2366667+00:00

    Hi @Satyasai Gunnam，

    When upgrading from .NET8 to .NET9, we not only need to adjust the Target framework, but also upgrade all packages to latest version.

    User's image

    For me, I upgraded below packages.

    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="9.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="9.0.0" PrivateAssets="all" />

    You need to check it in Nuget Package Manager tool.

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    If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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    Best regards,

    Jason

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