Cheat Engine Scan Error Thread 0 Please Fill Something In 100 Jun 2026

This error is purely user input validation – your Cheat Engine is working fine. Just fill in the value you want to search for.

Click the (Open Process button) in the top-left corner of Cheat Engine. Re-select your game from the Applications or Processes tab. Try running a fresh scan. Conclusion

Published: March 2025 – Guide applicable to Cheat Engine versions 6.2 through 7.5 and beyond.

Most "Thread 0" errors can be resolved by adjusting how Cheat Engine interacts with your hardware:

Click the in the top-left corner of Cheat Engine. This error is purely user input validation –

If you have entered a value and still see "thread 0" errors, it often points to permission or access issues: Run as Administrator : Right-click Cheat Engine and select Run as Administrator

How to Fix Cheat Engine "Scan Error: Thread 0 Please Fill Something In 100"

The phrase simply means the primary scanning process encountered a problem immediately.

Are you encountering this error while scanning a or after reaching a certain number of results? Re-select your game from the Applications or Processes tab

Never press First Scan or Next Scan while the Value field is empty unless you explicitly chose "Unknown initial value" as the scan type.

The "Scan Error" generally indicates that Cheat Engine’s scanner has run into a memory address it cannot read or scan. "Thread 0" refers to the primary scanning thread in Cheat Engine that has hit this road block.

Unlike typical memory access violations (like "Error scanning memory: 05 Access Violation"), this specific error is about anti-cheat software or protected processes. The "(100)" code refers to an internal Windows or driver I/O (Input/Output) status code, but the real clue is in the phrasing: "Please fill something in."

If you are scanning a massive memory range, you might be hitting protected zones. Most "Thread 0" errors can be resolved by

This tells Thread 0 that it does not need to look for a specific user-inputted string, which instantly bypasses the "Please Fill Something In" restriction.

If none of the above worked, the issue is deeper.

: Cheat Engine splits scanning workloads across multiple CPU threads. Thread 0 is the primary thread handling the initial data read.

A: Cheat Engine runs the scan on multiple threads for speed. Thread 0 is the primary scanning thread. If it fails, all others halt.

Uncheck and MEM_MAPPED if they are enabled, as these often contain read-only execution code that triggers thread access errors. Click OK to save the changes. 5. Add an Antivirus Exception