Rider Unity Integration Not Working

How to fix it

Try these in order — the most common fix is first.

1. 1. Set the external editor

   Copy steps
   1. In Unity open Preferences | External Tools
   2. Choose Rider as External Script Editor
   3. Click Regenerate project files
   Did this fix it? Yes No

2. 2. Update the Rider package

   Copy steps
   1. Open Window | Package Manager in Unity
   2. Update JetBrains Rider Editor to the latest version
   3. Reopen the solution in Rider
   Did this fix it? Yes No

3. 3. Clean state

   Copy steps
   1. Close Rider and Unity, delete the .idea folder and generated csproj/sln files
   2. Reopen from Unity via Assets | Open C# Project
   Did this fix it? Yes No

4. 4. NuGet in Unity

   1. Use NuGetForUnity or import the DLLs, because Unity itself does not restore NuGet packages
   Did this fix it? Yes No

Symptoms

Unity scripts open without Unity-aware completion, "cannot resolve symbol" errors on Unity types, Rider does not attach to the editor or double click opens the wrong editor.

Why it happens

• Rider not set as External Script Editor
• Outdated JetBrains Rider Editor package in Unity
• Stale generated csproj files
• Target framework mismatch with Unity Mono
• Unity does not natively support NuGet packages

This guide also covers

• rider unity not working
• rider cannot resolve symbol unity
• rider unity external editor
• rider unity attach

The same problem in other apps

All integrations, automations & extensions guides →

• VS Code Extension Host Terminated Unexpectedly (VS Code)

Other JetBrains Rider errors

• Rider .NET SDK Not Found / Project Cannot Load
• Rider NuGet Restore Failed
• Rider MSBuild Errors (Wrong Version / Build Fails in Rider but Not CLI)
• Rider Indexing Takes Forever / Stuck on Indexing
• Rider Out of Memory: How to Increase Heap Size
• Why Is Rider So Slow / Freezing?
• Rider License Activation Error / License Not Found
• Rider Plugin Incompatible After Update