Coding⏱️ 2 min read📅 2026-05-31

How to Fix: One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?

Missing references to Microsoft.CSharp.dll and System.Core.dll.

Quick Answer: Add a reference to Microsoft.CSharp.RuntimeBinder and System.Core.dll in your project.

The error 'One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?' occurs when the compiler is unable to find the necessary assemblies for dynamic typing.

💡 Why You Are Getting This Error

  • [Cause]

✅ Best Solutions to Fix It

Method 1: Adding References

  1. Step 1: Open your project in Visual Studio and go to the Project menu.

Method 2: Using the .NET Framework

  1. Step 1: Right-click on your project and select Properties.

🎯 Final Words

To resolve this issue, you can either add the necessary references to your project or use the .NET Framework. By following these steps, you should be able to fix the error and compile your code successfully.

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