PcaSvc.dll – Missing entry: PcaWallpaperAppDetect in Windows 11

After updating to Windows 11, version 24H2, you may see the following error message:

Error in C:\WINDOWS\system32\PcaSvc.dll

Missing entry: PcaWallpaperAppDetect

An invalid task causes this.

Resolution

The Windows Insider Team Blog has posted the following fix:

After updating to Windows 11, version 24H2 (Build 26100.712), you may see an Pcasvc.dll error dialog pop-up with the message “Missing entry: PcaWallpaperAppDetect”. We’re working on a fix, but you can follow these instructions to mitigate the issue:

1. Type “Task Scheduler” in the search box on the taskbar to find and open Task Scheduler.
2. On the left tree view of Task Scheduler, click on the “Task Scheduler Library” to expand the node.
3. Keep expanding the nodes by clicking on the tree view in the following order: Microsoft -> Windows -> Application Experience.
4. After clicking on the “Application Experience” node, find the task named “PcaWallpaperAppDetect” from the list view in the middle of Task Scheduler.
5. Right-click on that task, click “Delete” in the pop-up menu. Then click “Yes” in the confirmation dialog box asking, “Do you want to delete this task?”.

Source: Releasing Windows 11, version 24H2 to the Release Preview Channel | Windows Insider Blog

Deleting or turning off the task via the command-line

To turn off the task via Command Prompt (admin), run:

schtasks /Change /TN "Microsoft–Windows–Application Experience-PcaWallpaperAppDetect" /Disable

To delete the task via Command Prompt (admin), run:

schtasks.exe /delete /tn "Microsoft–Windows–Application Experience-PcaWallpaperAppDetect" /f

I hope that helps.