Coding⏱️ 2 min read📅 2026-06-03

How to Fix: Error CS0579 Duplicate 'global::System.Runtime.Versioning.TargetFrameworkAttribute'

Duplicate TargetFrameworkAttribute error in .NETCoreApp project. Remove duplicate attribute.

Quick Answer: Remove the duplicate attribute from your AssemblyAttributes.cs file.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

When building your application, you may encounter the CS0579 error due to a duplicate attribute in your .NET Core project. This error occurs when the TargetFrameworkAttribute is applied multiple times during the build process.

💡 Why You Are Getting This Error

  • Causes of this error include:

🔧 Proven Troubleshooting Steps

Method 1: Remove Duplicate Attribute

  1. Step 1: Open your project file and navigate to the TargetFrameworkAttribute line.
  2. Step 2: Delete the duplicate attribute, leaving only one instance.

Method 2: Use a Different Attribute

  1. Step 1: Replace the TargetFrameworkAttribute with the FrameworkAttributes attribute.
  2. Step 2: Ensure that you are using the correct version of the FrameworkAttributes attribute for your .NET Core project.

💡 Conclusion

By following these steps, you can successfully resolve the CS0579 error and continue building your application without any issues.

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