If the above steps don't resolve the issue, try the following advanced troubleshooting steps:
This is particularly evident when working through Cheat Engine's built-in tutorial. In Step 3, users are instructed to select "Unknown initial value" as the scan type, but this option only appears after scanning with no value in the Value box — and the tutorial does not always clearly communicate this requirement, especially when there is still a value like "100" remaining from a previous step.
For general configurations, verify that the range markers are safely bracketed from 00400000 to 7FFFFFFF (or capped at 7FFFFFFFFFFF on modern 64-bit spaces) to avoid hitting unreadable memory. If the above steps don't resolve the issue,
"Scan error: thread 0: Please fill something in 100" in Cheat Engine typically occurs when the software expects a specific input value or configuration setting that has been left blank or is invalid for the current scan type. This specific message is often tied to internal scan parameters or missing search criteria during a "New Scan". Common Fixes for Scan Errors
The “100%” likely comes from a misunderstanding of progress bars—some users think the scan is 100% complete, but in reality, the error occurs at 0% because no value was given. "Scan error: thread 0: Please fill something in
If exact value scans fail, start with an "Unknown Initial Value" scan, followed by "Increased/Decreased Value" scans. This is often more effective than looking for a specific number. Increase Disk Space:
If you've tried these methods and still experience the "Thread 0: Please fill something in" error, it is likely that the game's anti-cheat is actively blocking the scan. Try using Cheat Engine in a safe, offline environment. If exact value scans fail, start with an
The most frequent cause is insufficient permissions. If Cheat Engine is not run as an administrator, it cannot read the memory of protected processes, resulting in a thread error. Process Misattachment: