Attach Cheat Engine directly to your game's application window using the process select tool.
A less obvious cause of this error occurs when there is a mismatch between your "Scan Type" selection and the input required.
If you are staring at this pop-up, your first thought is likely: Fill what in? I already entered a value! This article breaks down exactly what this error means, why it occurs, and—most importantly—how to fix it permanently.
The Fast Scan option, which skips unaligned memory addresses, can sometimes fail on certain memory regions. Uncheck the box next to the Scan Type dropdown. Try conducting your scan again with this disabled. 3. Change the Scan Range Attach Cheat Engine directly to your game's application
If the game closed or crashed, Cheat Engine might lose connection.
Check the box. Ensure you actually typed a number or text before clicking "First Scan".
How to Fix "Cheat Engine Scan Error Thread 0 Please Fill Something In 100" I already entered a value
If you are using Cheat Engine to modify a game and suddenly encounter the error message it can be frustrating. This error often brings your hacking session to a halt, specifically when performing memory scans or using the "Scan" button [1].
When you see the red text in Cheat Engine’s status bar saying:
Repeat this cycle until only a few memory addresses remain in the left-hand panel. Double-click those addresses to add them to your bottom workbench where you can freeze or freely modify the numbers. Summary Troubleshooting Checklist Potential Root Cause Immediate Solution Value text container left entirely blank. Manually type a valid integer or float into the field. Scan type mismatch on hidden values. Switch Scan Type to Unknown Initial Value . Active target process disconnected. Uncheck the box next to the Scan Type dropdown
If the box isn't empty, a hidden advanced setting is likely triggering the bug. Resetting the scan parameters usually clears it.
If standard fixes fail, the game might be protected by an anti-cheat system that blocks standard Windows memory queries.