Modern Warfare 3: How To Fix COD MW3 Match Data Rules Error?

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Call of Duty: Modern Warfare 3 (MW3) is a popular game loved by many players. It gives a great gaming experience with its upgraded Infinity Ward (IW) engine. The recent release of the game made fans all over the world happy. But, there’s a problem affecting the fun for some players—the Match Data Rules Error. This specific issue messes with customizing the underbarrel attachment for the Pulemyot 762 gun, causing frustration among players. In this article, we’ll talk about the details of the Match Rules Data Error, what the developers are doing about it, and ways to fix it. This way, MW3 fans can enjoy their game without interruptions.

Overview of the COD MW3 Match Rules Data Error:

When players try to customize the underbarrel attachment for the Pulemyot 762 in MW3, they encounter the Match Rules Data Error. This problem messes up the smooth gaming experience the game wants to offer, causing trouble for players who want to improve their loadouts. Many reports from players about this error show that it’s important to fix it quickly. Players really want a solution, and it’s urgent because more and more incidents are being reported. Developers need to understand how important this is so that players can have the enjoyable gaming experience MW3 is meant to provide.

Developer Response:

The MW3 developers are working on fixing the Match Rules Data Error, and they’ve let everyone know on the Call of Duty Modern Warfare 3 Trello board. It’s good news for players because it shows the developers are taking the issue seriously and actively trying to solve it. They’re even making a patch update to address the problem. This is great for the gaming community because it shows the developers really care about making sure everyone has a good gaming experience.

Workarounds: How To Fix COD MW3 Match Data Rules Error?

While awaiting the official patch, players can take matters into their own hands with some temporary workarounds:

Clear Cache Of MW3 On Steam:

Sometimes, an error happens because of cache files that the game doesn’t need. Deleting these files can be a solution. Here’s how you can do it:

  • Go to your Steam library, right-click on COD MW3, and pick Manage.
  • Then, choose Browse Local Files. This takes you to where the game is installed.
  • Now, find the ‘mp23’ folder and look for the ‘main’ folder.
  • Inside, find and delete all the files with .dcache at the end.
  • After you’ve done this, start the game again and see if the problem is fixed.

Doing these steps cleans up the game’s extra files and might help get rid of the error for a better gaming experience.

Verify game files on Steam and

Verifying game files is a process that checks if all the game files are installed correctly and are not missing or corrupted. This can help fix the Match Rules Data Error by repairing any damaged files. To verify game files on Steam and, follow these steps:

  • For Steam users, launch Steam and open your game Library. Right-click on MW3 and select Properties. Go to the Local Files tab and click on Verify Integrity of Game Files. Steam will start scanning and verifying the game files, which may take several minutes. Once done, launch MW3 and check if the error is fixed.
  • For users, launch and go to the MW3 page. Click on the Options button and select Scan and Repair. will start scanning and repairing the game files, which may take several minutes. Once done, launch MW3 and check if the error is fixed.

Equipping Underbarrel Attachment During Match:

As a temporary measure, try equipping the underbarrel attachment while in a match. This workaround may help navigate around the error and allow for uninterrupted gameplay. Just put the underbarrel on the Pulemyot 762 when you’re playing a match. You can go to the loadout menu to do this.

Restarting as a Simple Troubleshooting Method:

Sometimes, just restarting things can help a lot. If you’re having trouble with the game MW3, try restarting the game or your whole computer. This simple fix might be overlooked, but it can actually do a great job at fixing problems. So, if you’re dealing with issues, don’t underestimate the impact of a simple restart – it might just solve the problem.

Reassurance and Patience:

It’s crucial for players to understand that the developers are actively working on a permanent fix through a forthcoming patch. While trying the provided workarounds, patience is key. These temporary solutions are meant to ease the frustration temporarily, and a more comprehensive resolution is on the horizon.


To sum it up, the Match Rules Data Error in COD MW3 is causing frustration, especially for players trying to customize the underbarrel attachment for the Pulemyot 762. The developers know about it and are actively fixing it with a patch update. While waiting for the fix, players can try temporary solutions like clearing cache files, checking game files, and using the attachment during a match. Patience is key as developers work on a permanent solution. For updates and guides about MW3, visit, where we aim to share helpful info for gamers. We hope this guide helps players deal with the Match Rules Data Error and enjoy Call of Duty: Modern Warfare 3 smoothly.

Also Read: Modern Warfare 3: How To Fix MW3 Zombies Golden Enigma Not Working Issues?

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