How to fix
Missing entry: PcaWallpaperAppDetect error
on Windows

I recently updated to Windows 11 version 24H2 via the Preview channel and I started getting the following error "Error in C:\\WINDOWS\system32\PcaSvc.dll. Missing entry: PcaWallpaperAppDetect." Is there something I can do to get rid of it?

The Release Preview of the newest Windows version 24H2, launched on May 22, 2024, excited many users eager to experience the latest features and improvements. However, with every new version, some issues are inevitable. One of the errors users have encountered is the "Missing Entry: PCAWallpaperAppDetect" error, which reads in full: "Error in C:\WINDOWS\system32\PcaSvc.dll. Missing entry: PcaWallpaperAppDetect."

Why this issue occurs

The "Missing Entry: PCAWallpaperAppDetect" error is often linked to software known as Microsoft's PowerToys. To be more precise, it stems from a scheduled task in the Task Scheduler under Scheduler Library\Microsoft\Windows\Application Experience named "PcaWallpaperAppDetect," which sometimes fails to execute properly because of the new 24H2 Windows version, resulting in the missing entry error.

Possible fixes for the error

To resolve the "Missing Entry: PCAWallpaperAppDetect" error, you can try the following steps. First, ensure that all Windows updates are installed, as these updates may include a fix for the issue.

If no updates are available or the problem persists, you have a few options: disable the scheduled task "PcaWallpaperAppDetect" in the Task Scheduler, update the PowerToys application to its latest version, or uninstall PowerToys if updating does not resolve the problem. If these steps still do not help, there are additional solutions provided below this article.

For automatic fixes to underlying Windows issues, consider using a PC repair tool like [d1].

Fix 1. Update PowerToys and Windows

Updating PowerToys and Windows ensures you have the latest patches and fixes, which might resolve the error.

• Type Updates in Windows search and press Enter.
• When the new window opens, click Check for updates (or Install all if pending) and wait.
• If there are optional updates available, install them as well.
• After updating, restart your computer.

To update an app from Microsoft Store (such as PowerToys), follow these steps:

• Open Microsoft Store.
• Click on Library.
• If updates are pending, click Update all.
• Otherwise, click Get updates.
• You can also update the app individually.

Fix 2. Disable the scheduled task

Disabling the "PcaWallpaperAppDetect" task prevents it from attempting to execute, which can stop the error.

• Type Task Scheduler in Windows search and press Enter.
• Navigate to Task Scheduler Library\Microsoft\Windows\Application Experience.
• Locate the PcaWallpaperAppDetect task on the right.
• Right-click the task and select Disable.
• The error should no longer show up.

Fix 3. Uninstall PowerToys or other related app

Uninstalling PowerToys removes the software that might be causing the error.

• Open Windows Settings.
• Go to Apps.
• Find PowerToys (or another related app) in the list.
• Click on the app and select Uninstall.
• Follow the on-screen instructions to complete the uninstallation.

Fix 4. Uninstall Windows 24H2 update

If the error started after updating to Windows 24H2, reverting to the previous version might resolve the issue.

Windows 11

• Open Windows Settings.
• Select System on the left.
• Click on Recovery.
• Under Recovery options, select Go back.
• Follow on-screen instructions to finalize the process.

Windows 10

• Open Windows Settings.
• Go to Update & Security.
• Select Recovery from the sidebar.
• Click Get Started under the Go back to the previous version of Windows 10 section.
• Follow the on-screen instructions to complete the process.

Fix 5. Check for other apps that might be connected to the error

PowerToys is not the only app that can be causing the Missing entry: PcaWallpaperAppDetect error. Therefore, you should check for similar apps and uninstall them. Likewise, you could also use the previous steps described in Fix 2 to eliminate the task that causes the error.