Software⏱️ 2 min read📅 2026-05-31

How to Fix: EF Core add-migration Build Failed

EF Core add-migration Build Failed: Troubleshoot the error by checking for conflicts with existing migrations, running "update-database" to apply pending changes, and verifying the .NET Core version.

Quick Answer: Check for conflicts with existing migrations, run "update-database" to apply pending changes, and ensure .NET Core version is compatible.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

[2 paragraphs intro]

💡 Why You Are Getting This Error

  • [Cause]: The most common cause of this error is a missing or invalid database provider in the project. This can occur if the database provider has not been installed correctly, or if it is not compatible with the .NET Core version being used.

🛠️ Step-by-Step Verified Fixes

Method 1: Database Provider Configuration

  1. Step 1: Check if the database provider is installed correctly in the project. Ensure that it is added as a NuGet package and configured correctly in the appsettings.json file.

Method 2: Update .NET Core Version

  1. Step 1: Ensure that the .NET Core version being used is compatible with the database provider. If an older version of .NET Core is being used, update to a newer version.

💡 Conclusion

[Wrap-up]: By following these steps and troubleshooting the cause of the error, you should be able to resolve the 'Build failed' issue when running add-migration in a .NET Core EF project.

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