Missing app configuration error is most probably caused due to corrupted appinfo.vdf file. This issue can also be caused due to a bug in Steam. This file stores data about the games. To resolve this issue, follow the methods listed below:
Fix 1. Remove appinfo.vdf file:
If the appinfo.vdf file is corrupted, deleting it can get you rid of this error. Steam will be forced to create a new instance of this file on the next run. Here’s how you can delete this file:
- Exit the Steam app, open the File Explore and go to this location (You can also paste this in the address bar of the explorer, which is located at the top and hit Enter):
C:\Program Files (x86)\Steam\appcache\ - Right-click appinfo.vdf and Delete it.
- Run Steam again as administrator and initiate the process again.
Fix 2. Install/Wait for Steam Updates:
If the error persists, then there might be a bug in Steam causing this issue. Updating Steam might fix this issue for you. Steam automatically install updates if there are any available, but you can try doing it manually as well. For this, simply launch Steam, click on Steam at the top, then select ‘Check for Steam Client Updates‘.
Fix 3. Verifying Integrity of Game Files:
If both the above mentioned methods didn’t work for you, you should try this as well.
- Open Steam and access your Library.
- Right-click the game that is causing this issue, and select ‘Properties‘.
- Select ‘Local Files‘ from the left-pane and click on ‘Verify integrity of game files‘.
