When you paste a number (e.g., 100) from a wiki or notepad, you often accidentally copy an invisible character like a line break (\n) or a carriage return (\r). Cheat Engine sees [BLANK]100 and throws an error because the first character isn't a number.
The 100% better fix: Delete the value box entirely. Type the number manually with your keyboard. Do not paste.
You are scanning for a health value of 100 (Float/Decimal), but you left the "Value Type" on Binary or Byte. Cheat Engine tries to convert 100 into a binary string of 1s and 0s, fails, and defaults to "nothing filled in."
The 100% better fix: Always match the Scan Type (e.g., Exact Value) and Value Type (e.g., 4 Bytes for integers, Float for decimals).
If you still see "Scan Error: Thread 0", the game process likely has kernel-level hooks blocking CE. In that case, consider using Cheat Engine Lite or a Kernel-mode bypass (advanced, not covered here).
Still stuck? Provide the exact game name and Cheat Engine version in a comment for a targeted fix.
"Scan error: thread 0: Please fill something in" is a common prompt in Cheat Engine that occurs when a user attempts to perform a scan without providing a search criteria in the value input box. While it may appear technical, it is essentially a UI safeguard that prevents the software from executing an undefined memory search. Understanding the Error Mechanics When you paste a number (e
Cheat Engine operates by scanning the memory (RAM) of a target process for specific values or patterns. When you click "First Scan" or "Next Scan," the software's scanning threads—starting with —look for the data you have defined.
If the value field is empty, the software cannot initiate the scan because: Undefined Parameters
: It has no target value to compare against existing memory addresses. Thread Failure
: The scanning thread fails to initialize its task, leading to the "thread 0" error notification. Primary Troubleshooting Steps Still stuck
To resolve this error and ensure a successful scan, you must provide a valid input for the scanner to process: Input a Value
: Ensure there is a number or hex string in the "Value" box before clicking scan. Select Scan Type
: If you do not know the exact value, change the "Scan Type" from "Exact Value" to "Unknown initial value" . This allows the scan to begin without a specific number. Check Value Type
: Ensure the "Value Type" (e.g., 4 Bytes, Float, String) matches the data you are trying to find. Administrative Rights : Run Cheat Engine as an Administrator When you paste a number (e.g.
to ensure it has the necessary permissions to access the memory of other processes. Advanced Scan Failures
If you have filled in a value but still encounter thread errors or "0 results," the issue may be deeper: Security Software
: Antivirus programs or firewalls can block Cheat Engine's memory-reading threads, sometimes necessitating an exclusion or temporary disablement. Memory Protection
: The game or application may have anti-cheat measures that hide or protect its memory regions from external scanners. Temporary Files
: A full disk or lack of write permissions in the temporary scan folder can cause thread errors. You can change this path in Settings > Scan Settings Cheat Engine:Memory Scanning
That Thread 0 means the primary scanning thread crashed before it could start. This happens when CE cannot allocate memory in the target process.