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Learn how to fix the `Duplicate base paths` error in your Blazor projects when using Razor Class Libraries. This guide will help you navigate the issue step-by-step!
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This video is based on the question https://stackoverflow.com/q/62643057/ asked by the user 'Heinzlmaen' ( https://stackoverflow.com/u/2767662/ ) and on the answer https://stackoverflow.com/a/62643058/ provided by the user 'Heinzlmaen' ( https://stackoverflow.com/u/2767662/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Duplicate base paths Error in Blazor with Razor Class Libraries

If you're a developer working with Blazor, you may have encountered a frustrating issue after updating to Blazor version 3.2.0. Many users reported receiving an error message that states: "Duplicate base paths '/' for content root paths." In this guide, we will discuss what causes this error and provide a clear solution that you can implement to resolve it.

Understanding the Problem

The error typically occurs when you are using a Razor Class Library (RCL) alongside a Blazor WebAssembly project. Specifically, it arises after updating the packages in your project and trying to reference the RCL directly.

What Triggers the Error?

When you reference a Razor Class Library that contains specific WebAssembly packages, you might see the following indicators in your project:

An error message highlighting duplicate base paths.

Additional paths that may point to temporary directories, such as:

[[See Video to Reveal this Text or Code Snippet]]

This situation can occur even if the Blazor project works fine when referencing a published version of the Razor library.

Solution: Removing WebAssembly References

To fix the Duplicate base paths error, a recommended approach is to modify your Razor Class Library. Here’s how you can make it work:

Step 1: Update Package References

You need to remove all the WebAssembly-specific packages from your Razor Class Library project. Change your package references in your .csproj file from:

[[See Video to Reveal this Text or Code Snippet]]

to:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Clean and Rebuild Your Project

After making the above changes:

Clean your solution to remove any previous build caches.

Rebuild your Blazor project and the Razor Class Library.

Step 3: Test the Solution

Run your Blazor application again and see if the issue persists. By removing the WebAssembly dependencies from the Razor Class Library, you should eliminate the duplicate base path error.

Conclusion

In summary, the duplicate base paths error in Blazor when referencing Razor Class Libraries can be resolved by carefully managing your package references. By removing any unnecessary WebAssembly components from your Razor Class Library, you can avoid conflicts and continue developing your application seamlessly.

For additional clarity on this solution, special thanks to Jan-Willem Spuij (@ jspuij) for identifying the necessary steps to resolve this issue effectively.

If you have further questions or need assistance, feel free to drop a comment below!