The error "Scan error: thread 0: Please fill something in 100" (often accompanied by variations like "Stream read error" or "Access violation") generally indicates that Cheat Engine is failing to access, write, or read the temporary scan files it uses to compare memory values.
Below is a breakdown of why this happens and how to resolve it. Core Causes
Permission Issues: The most common cause is Cheat Engine lacking administrative rights or being blocked from writing to its own temporary folder.
Disk Space/File System Errors: If your drive is nearly full (less than 500MB free) or has corrupted sectors, the scan files cannot be generated.
Antivirus Interference: Security software may flag Cheat Engine's memory-reading behavior as suspicious, "locking" the thread or the files it tries to create.
Protected File Paths: Using a Windows "Documents" folder or a path with non-ASCII characters in the username can sometimes cause file-pathing errors. Recommended Solutions
Run as Administrator: Right-click the Cheat Engine executable and select Run as Administrator to ensure it has full system permissions. Change Scan File Location: Go to Settings > Scan Settings.
Check the box to set a custom path for temporary scan results.
Choose a simple, unprotected folder like C:\CE_Temp to avoid permission conflicts.
Check Disk Space: Ensure you have at least 500MB to 1GB of free space on the drive where Cheat Engine is installed or where temporary files are stored.
Whitelist in Antivirus: Add Cheat Engine to your antivirus exclusion list or temporarily disable real-time protection to see if the error clears. Adjust Scan Settings:
Ensure MEM_MAPPED is enabled in Settings > Scan Settings if you are scanning specifically protected memory regions.
Verify that "Writable" is checked in the Memory Scan Options if you are looking for standard values like health or currency. Understanding the "100" in the Error
The "100" in this specific error string typically refers to an internal buffer or a specific segment of the scanning process that failed to initialize. When Cheat Engine asks you to "fill something in," it essentially means the program expected data from the scan thread but received a null or empty response, often due to the access issues mentioned above.
Scan error:thread 0:Please fill something in 100 - Cheat Engine
The error "Scan error: thread 0: Please fill something in 100" is typically a syntax or input validation error in Cheat Engine. It occurs when a scan is initiated while the Value input field contains an invalid entry or is improperly configured for the selected Scan Type. Immediate Fix
The most direct solution is to fill in a valid value in the input box before clicking "First Scan" or "Next Scan". Cheat Engine requires a starting point to search memory; if the field is empty or contains non-numeric characters for a numeric scan, this error can trigger. Common Troubleshooting Steps
If the error persists despite entering a value, try these community-recommended fixes:
Run as Administrator: Ensure Cheat Engine has full system permissions. Right-click the executable and select Run as Administrator. Check Scan Settings: The error "Scan error: thread 0: Please fill
Value Type: Ensure you have selected the correct type (e.g., 4 Bytes, Float, or All).
Writable Memory: In Settings > Scan Settings, try marking "Writable" as optional if the value you are looking for is in a read-only region.
MEM_MAPPED: Some users resolve scan issues by enabling "MEM_MAPPED" in Settings > Scan Settings. Temporary File Issues:
Disk Space: Ensure you have at least 500MB of free hard drive space for temporary scan files.
Permissions: Verify that the folder where Cheat Engine is installed is not "Read-only" and that you have permission to write to it.
Custom Path: Try changing the temporary scan file location to a non-protected folder via Settings > Scan Settings.
Security Software Interference: Antivirus or firewall programs (such as Comodo) can sometimes block Cheat Engine's memory access, leading to thread errors. Try temporarily disabling them to test.
Process Affinity: Some older versions of Cheat Engine benefit from setting the process affinity to a single CPU core in the Task Manager under the Details tab. Alternative Scanning Methods
If "Exact Value" scans continue to fail, try using more flexible methods: Set Scan Type to "Unknown Initial Value". Perform a "First Scan."
Change the value in-game, then select "Increased Value" or "Decreased Value" for the "Next Scan".
Are you seeing this error with a specific game, or does it happen with every process you try to scan? View topic - Scan error:thread 0:access violation?
"Scan error:thread 0:Please fill something in 100" in Cheat Engine
typically points to a permissions issue or a failure to access temporary scan files Quick Fixes Run as Administrator : Ensure you right-click Cheat Engine and select Run as administrator . This is the most common fix for thread 0 access errors. Check Free Disk Space : Cheat Engine requires at least 500MB of free space
on your drive to store temporary scan files; if the drive is full, scans will fail immediately. Verify Folder Permissions : Ensure the current Windows user has full read and write permissions for the folder where Cheat Engine is installed. Set Processor Affinity
: Some users resolve thread 0 errors by right-clicking Cheat Engine in Task Manager , going to , right-clicking the process again, and selecting Set affinity to ensure it isn't restricted. Troubleshooting Settings Memory Settings Settings > Scan Settings and ensure that MEM_MAPPED is enabled. Repair Tools : Locate the repair+reset settings tools
within the Cheat Engine installation folder to clear any corrupted configurations. Check for Anti-Virus Interference
: Modern security software may block Cheat Engine's memory access. Temporarily disable your Anti-Virus or add Cheat Engine to the exclusion list.
Troubleshooting the Cheat Engine Scan Error: Thread 0 - A Comprehensive Guide Incompatible or outdated Cheat Engine version : Using
Are you encountering the frustrating "Cheat Engine scan error: Thread 0, please fill something in" error while attempting to scan for values in Cheat Engine? You're not alone. This error has been reported by numerous users, and it's essential to address it to ensure a seamless Cheat Engine experience.
Understanding Cheat Engine and Its Scanning Process
Cheat Engine is a popular tool used by gamers and developers to analyze and modify game memory. Its scanning feature allows users to find specific values in a game's memory, which can be useful for creating cheats, debugging, or optimizing game performance. The scanning process involves searching for values in the game's memory, and Cheat Engine provides various scan types, including exact, fuzzy, and increased/decreased scans.
The Scan Error: Thread 0 - Causes and Symptoms
The "Cheat Engine scan error: Thread 0, please fill something in" error typically occurs when users attempt to initiate a scan. The error message is often accompanied by a crash or a freeze, making it challenging to use the application. The causes of this error can be attributed to:
Step-by-Step Solutions to Resolve the Scan Error
To resolve the "Cheat Engine scan error: Thread 0, please fill something in" error, follow these step-by-step solutions:
If:
If you are reading this, you have likely just slammed your fist on your desk. You’ve opened Cheat Engine (CE), attached it to your game (or application), typed in a value, hit "First Scan," and instead of a list of memory addresses, you are met with a red, cryptic message:
"Scan Error: Thread 0: Please fill something in (100% better)"
Or a variation thereof, sometimes reading: "Thread 0: Something went wrong. Please fill something in. 100% better."
This error is infuriating because it is contradictory. You did fill something in. You put a number in the "Value" box. So why is the software acting like you didn't?
This article will dissect this error completely. We will move from the "why" to the "how," and by the end, you will have a solution that is 100% better than just restarting your PC.
Temporarily disable your antivirus software to prevent interference with Cheat Engine's scanning process.
Stop guessing. Follow these tiers of fixes from Low effort (90% success) to Advanced (100% success) .
If you want, provide the exact target process name, Cheat Engine version, and a screenshot or exact text of the full error, and I’ll give a targeted sequence of commands and checks.
The error message "Scan error: thread 0: Please fill something in"
typically occurs when Cheat Engine is asked to perform a scan (usually a "Next Scan") but the value input field is empty or contains invalid data for the selected scan type Cheat Engine Step-by-Step Solutions to Resolve the Scan Error To
This issue often arises when users are following scripts or complex tables where a scan is triggered automatically or via a hotkey without a target value being defined in the UI. Common Causes & Troubleshooting Empty Value Box
: Ensure you have typed a number into the "Value" field before clicking "First Scan" or "Next Scan". Invalid Scan Type
: If your scan type is set to "Exact Value" but no value is provided, this error triggers. If you don't know the value, change the scan type to "Unknown initial value" Broken Scripts
: If using a pre-made Cheat Table (.CT), a script might be trying to perform a scan on a null or uninitialized address. Try updating the script or manually performing an AOB (Array of Bytes) scan to find the correct memory location. Permissions
: Cheat Engine requires administrative privileges to read and write game memory. Right-click the Cheat Engine executable and select "Run as Administrator" Scan File Access
: The "thread 0" prefix often points to a failure in the initial scanning thread. This can be caused by a lack of disk space (ensure at least 500MB free) or antivirus software blocking Cheat Engine's temporary scan files. Cheat Engine Advanced Fixes
Scan error:thread 0:Please fill something in 100 - Cheat Engine
"Scan error: thread 0: Please fill something in" (often followed by a number like 100) typically occurs when Cheat Engine attempts to perform a scan but the "Value" input box is empty or contains invalid data. Immediate Solutions Enter a Value
: Ensure you have typed the number you are looking for into the box before clicking "First Scan" or "Next Scan". Clear the Box
: If there is a "0" or "100" appearing automatically that you didn't type, delete it and manually re-type your target value. Check Value Type
: If you are scanning for a string or array of bytes but the box is empty, Cheat Engine will trigger this thread error because it has no data to compare against memory. If the Box is NOT Empty
If you have a value entered but still see the error, try these technical fixes: Run as Administrator : Right-click Cheat Engine and select Run as Administrator
to ensure it has permission to access the game's memory and write its own temporary scan files. Change Scan File Location Scan Settings
Check the box for a custom path and set it to a folder that is not protected (like a folder on your desktop). Toggle MEM_MAPPED Scan Settings and try unchecking or checking the MEM_MAPPED
option. Some users report this resolves access violations during scans. Check Disk Space : Ensure your drive has at least 500MB of free space
, as Cheat Engine creates large temporary files during the initial scan. Common Causes for "Thread 0" Errors Permissions
: The most common reason for "Thread 0" errors is a lack of read/write permissions for the temporary files CE creates. Antivirus Interference
: Some security software prevents Cheat Engine from reading memory or writing its temporary scan files. Corrupt Installation : If the error persists across different games, use the Repair/Reset Settings
tool in the Cheat Engine installation folder or perform a clean reinstall. Does this error happen immediately upon clicking First Scan , or only after you've already found some results? View topic - Scan error:thread 0:Stream read error
All scans every memory region type. Some regions throw errors.Byte, 2 Bytes, 4 Bytes, or Float depending on your value.