Try these:
Adjust system settings to ensure they're not interfering with Cheat Engine:
The “Thread 0: Please fill something in 100 new” error is almost always caused by an empty or invalid memory range in Cheat Engine’s scan configuration. Resetting scan parameters or clearing the CE configuration file resolves the issue in over 90% of cases. If the problem persists, consider switching to an older stable version (e.g., CE 7.3) or using a virtual machine for the target process. Try these:
Appendix – User Workaround Example
“I set Start = 00400000, Stop = 7FFFFFFF, unchecked ‘Skip PAGE_GUARD’, and scanned with ‘Value Type’ = Byte. Error gone.” – CE Forum User Adjust system settings to ensure they're not interfering
Follow these steps in order. Most users solve the problem by step 3.
Based on user reports and debugging, common causes include: Configure Firewall settings :
| Cause | Description |
|-------|-------------|
| Invalid scan range | User left “Memory scan options” → “Start” and “Stop” addresses empty or incorrectly formatted. |
| Corrupted Cheat Engine settings | Previous scan configurations saved in cheatengine-x86_64.exe.ini cause conflicts. |
| Anti-cheat interference | Some anti-cheat systems (EAC, BattlEye) block memory reads and trigger this fallback error. |
| Process memory protection | Target process has PAGE_GUARD or restricted pages that CE cannot scan without special settings. |
| Old or beta version bug | Specific bug in CE 7.4 – 7.5 beta related to “Fast Scan” or “MEM_PRIVATE” regions. |
You can’t. “Unknown initial value” still requires a placeholder. Type 0 or 1—the scan will ignore it. But the field cannot be empty.
Report Date: 2026-04-12
Software: Cheat Engine (version 7.x or later)
Issue Category: Scan error / Memory scanning failure
Some games employ anti-debugging mechanisms to prevent cheating. Try disabling these mechanisms: