Sometimes, Cheat Engine lacks the elevated permissions necessary to read memory, resulting in a thread failure. Close . Right-click the CheatEngine.exe icon. Select "Run as Administrator" . 3. Use "Hide Cheat Engine" from System
Run Cheat Engine as an to ensure it has permission to read the process memory.
If you’ve followed these steps and still see "Thread 0," try restarting both the game and Cheat Engine. Occasionally, anti-cheat software (like Easy Anti-Cheat) will "stealth-block" the scan thread, causing this error to appear as a generic failure message.
The term "100 upd" is likely a typo or a specific variable name from a table you are using. It most likely refers to:
Many game values, especially in modern games, are "dynamic"—their memory address changes every time you restart the game. A "pointer" is a stable address that always points to the dynamic value. Cheat Engine's feature helps you find these pointers. Select "Run as Administrator"
Verify the is set to default (typically 00400000 to 7FFFFFFF ) so it doesn't immediately fail due to an invalid memory range.
If you are a user of —the popular open-source memory scanning tool—you may have encountered a frustrating scan error, particularly in newer or heavily updated games. The specific error message "Scan Error: Thread 0 Please Fill Something In" (often accompanied by 100 upd or 100 patched ) usually indicates a conflict between Cheat Engine, your Windows OS, or the anti-cheat system of the game you are targeting.
: You selected a scan type that expects a specific input (such as Exact Value , Value Greater Than , or Value Between ) but left the input text field blank.
If you’ve landed on this page, you’re likely staring at a frustrating red error box in Cheat Engine. The message reads something like: . You’ve tried restarting, reinstalling, and maybe even switching games—but nothing works. If you’ve followed these steps and still see
Uncheck the Hex box unless you are specifically looking for a hex code. 5. Administrative Privileges
The "cheat engine scan error thread 0 please fill something in 100 upd" is a blessing in disguise. Its message is surprisingly literal and direct: . Before you tweak CPU affinities or mess with scan buffers, make absolutely sure you have entered a value in the "Value" box or selected "Unknown initial value" as your scan type. Nine times out of ten, that simple check will solve the problem instantly.
The target application must be selected.
Fixing the Cheat Engine "Scan Error: Thread 0: Please Fill Something In" slow down the game
For all other games (emulators, older Steam games, standalone executables), the fixes above will resolve the issue. The key is to remember that "100 upd" means Cheat Engine is waiting for memory updates that aren't arriving – so your solution must either speed up the thread, slow down the game, or filter out the dead regions.
Change the directory path from the default hidden AppData profile to a clean, universal path like C:\CEScans\ .
Sometimes Cheat Engine "loses" its connection to the game window, leading to a thread error because it doesn't know which memory to scan.