A user discovered this solution on the Cheat Engine forums:
Ensure the game you're trying to use Cheat Engine with is supported. Some games have specific settings or workarounds required for use with Cheat Engine.
Cheat Engine :: View topic - Scan error:thread 0:access violation?
Always use Cheat Engine responsibly and only with single-player games where you have permission to modify memory. Using memory editors with online multiplayer games that employ anti-cheat can result in permanent bans, and in some cases may violate terms of service or local laws regarding software modification.
“You asked me to scan, but you didn’t tell me what to look for.” A user discovered this solution on the Cheat
Cheat Engine includes an excellent built-in tutorial (Help → Cheat Engine Tutorial) that walks users through all the fundamental concepts, including proper scanning techniques. Working through the tutorial is highly recommended for users of all experience levels.
in Cheat Engine settings. This has been noted as a solution for certain access violation errors in some versions of Cheat Engine.
Temporarily disable "Real-time protection" to see if the scan error disappears. 4. Adjust "Scan Settings" in Options If the error persists, your scan ranges might be messed up. Go to . Click on Scan Settings .
The is one of the most common but easily fixable errors in Cheat Engine’s long history. It’s not a hardware failure, a virus, or a broken game. It’s simply Cheat Engine’s way of saying: Always use Cheat Engine responsibly and only with
At the very bottom left of the settings window, click the button. Confirm the prompt to reset all preferences to default. Restart Cheat Engine and try your scan again. 3. Clear the Scan Tab Cache
Instead of standard scans, open the memory view windows, click Tools , and use Dissect data/structures to find values visually within memory blocks. If you want to troubleshoot further, let me know:
Forgetting to enter a numerical value in the search field before hitting First Scan or Next Scan .
Always make sure you are using the latest version of Cheat Engine, as updates often include fixes for thread errors on newer versions of Windows 10 and 11. Working through the tutorial is highly recommended for
Some users report encountering "scan error: thread 0: Access violation at address..." messages, which indicate a different problem — typically a multi-core CPU conflict or memory access issue rather than an empty value field.
Trying to scan for a value type that doesn't exist or using an invalid address range. How to Fix Cheat Engine Scan Errors 1. Run as Administrator (The #1 Fix)
Ensure there are no accidental letters, hidden spaces, or special characters inside the field.
The error is also notably common when users are attempting to create Auto Assembler (AA) scripts or AoB (Array of Bytes) scans for game modifications. As one community member described: "I am so new to Cheat Engine yet I like to make one hit kill scripts because I love computer games. But some game always show 'Error while scanning for AOB's:1hk Error: thread 0: Please fill something in (100)'."
Leaving a default value type (like 4 Bytes) while selecting a scanning method that demands manual parameter entry.