Microsoft recently released the Windows 11, version 24H2 in a release preview which has many users excited. However, after updating to Windows 11 24H2, many users are encountering a Pcasvc.dll error dialog pop-up with the message “Error in C:\WINDOWS\system32\PcaSvc.dll. Missing entry: PcaWallpaperAppDetect”.

While Microsoft has officially acknowledged this bug and they are working on a fix. The bug seems to be arising from using third-party wallpaper apps. You can currently solve it by using a simple workaround. It involves going to the task scheduler and deleting the related task.

Check for Updates

It's possible that in the time that you encountered this error, Microsoft has already released a fix for this bug. So, to fix it, the first thing you should do is check for updates.

  1. Open the Settings app (Windows + I) on your PC.
  2. Then, go to 'Windows Update' from the left menu.
  1. Click on 'Check for Updates'.
  1. Download and install any updates.

Delete the PcaWallpaperAppDetect Task

Now, if there is no update that has fixed the issue yet, you should try this workaround.

  1. Go to the search option in the taskbar, type 'Task Scheduler' and open it from the search results.
  1. Click on the arrow before the 'Task Scheduler Library' option from the left pane to expand it.
  1. Further, go to Microsoft > Windows > Application Experience.
  1. Once the Application Experience folder contents appear in the middle pane, go to the 'PcaWallpaperAppDetect' task from the list. Right-click on it and select 'Delete' from the menu.
  1. Click 'Yes' from the confirmation dialog box.

This should fix the 'Missing Entry: PCAWallpaperAppDetect' error on your Windows 11 PC until Microsoft officially releases an update to remove this bug from 24H2.

Microsoft is currently rolling out the Windows 11 24H2 update in a release preview. Many of the users who have received the update have been encountering this runDLL error. Fortunately, even without an official fix, it is easy to resolve this error on your PC using the above workaround.