Software⏱️ 3 min read📅 2026-06-11

How to Fix: Win10 Cortana failing with "Activation of app [...] CortanaUI failed with error: The remote procedure call failed"

Cortana not working on Windows 10 Pro, error: The remote procedure call failed. Possible solution: re-register packages and check TWinUI log.

Quick Answer: Try re-registering Cortana packages and check the TWinUI log for additional information.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

Cortana is not functioning properly on Windows 10 Pro, causing issues with search functionality. This error affects users who have upgraded from Windows 8.1 Pro to Windows 10 Pro and have performed a Windows Reset.

This issue can be frustrating for users who rely on Cortana for quick searches or have difficulty accessing the Start Menu due to its slow performance.

🔍 Why This Happens

  • The primary cause of this error is a corrupted package in the Windows AppX store. During the upgrade and reset process, the package may have become damaged, leading to issues with Cortana's functionality.
  • Another possible reason for this error is a conflict between the SearchUI.exe process and the TWinUI log, which can cause the remote procedure call to fail.

🛠️ Step-by-Step Verified Fixes

Re-registering the Cortana package

  1. Step 1: Open Command Prompt as an administrator and navigate to the C: oot older path. Type `Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\
  2. Step 2: AppXManifest.xml"}` and press Enter to re-register all Cortana packages.
  3. Step 3: If the issue persists, try restarting your computer and then attempting to re-register the package again.
  4. Step 4: After successful re-registration, attempt to access Cortana and see if the search functionality improves.

Resetting the Start Menu and Cortana

  1. Step 1: Open Settings > System > Restart the task host worker process for all apps. This will reset the Start Menu and Cortana.
  2. Step 2: If the issue persists, try restarting your computer after resetting the task host worker process.

💡 Conclusion

To resolve this issue, try re-registering the Cortana package or resetting the Start Menu and Cortana. If neither method resolves the issue, it may be necessary to perform a clean installation of Windows 10 Pro.

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