After investigating the issue and looking at various user reports, it turns out that this problem can occur due to multiple different reasons. Here’s a shortlist of confirmed potential culprits:

Method 1: Running Merge Plugins with Admin Access

If you didn’t try this already, your first attempt at fixing this issue should be to run the main executable of the Merge Plugins utility with admin rights. This fix was confirmed to be successful by a lot of users that were previously encountering the Access Violation error. To do this, use File Explorer (My Computer on older Windows versions) and navigate to the location where you previously installed the Merge Plugins utility. Once you get there, look for the main MergePlugins.exe executable. When you see it, right-click on it and choose Run as Administrator from the newly appeared context menu. When you’re prompted by the User Account Control (UAC), click Yes to grant admin access. Once you have successfully opened the Merge Plugins utility with administrator access, repeat the action that was previously causing the Access Violation error and see if the problem is now resolved. In case the same problem is still occurring, move down to the next potential fix below.

Method 2: Taking Ownership of the Game and Mod folders

According to some affected users that managed to fix the Access Violation error, this problem can very well be caused by an ownership problem. As it turns out, the game folder where you’re trying to do the modification on or the mods files might not be owned by the account you’re currently using, so the process fails. If this scenario is applicable, you should be able to fix the problem by taking ownership of the involved folders and making sure that your account has the rights to modify them before retying the plugin merging operation. Here’s a quick guide on how to do this: Note: The instructions below assume that the game & mod files are present inside the temp folder. If the location is different in your case, adapt the steps below accordingly. If you already took ownership of the involved folders and you’re still seeing the same Access Violation error when trying to use the Merge Plugins utility, move down to the next potential fix below.

Method 3: Disable the Read-Only Attribute

As some affected users have confirmed, this problem can also occur in instances where some of the files you end up loading inside the Merge Plugins utility are actually restricted via the read-only attribute. As long as this attribute is enabled, the utility will be prevented from modifying and updating the files. Several affected users that were previously dealing with the same problem have reported that the issue was finally resolved once they have gotten rid of the Read-Only attribute. If you ensure on how to do this, follow the instructions below: In case you still end up encountering the Access Violation error, move down to the next potential fix below.

Method 4: Disable Antivirus & Firewall (if applicable)

As it turns out, this problem can also be caused by some type of antivirus interference that is preventing the Merge Plugins from completing the operation. If this scenario is applicable in your particular scenario, you should be able to fix this problem by disabling the real-time protection while using the Merge Plugins utility. This problem is mostly reported to occur with Kaspersky and Avira antivirus and most affected users have reported that they managed to fix this problem by disabling the real-time protection of your antivirus before repeating the operation. In most cases, you’ll be able to do this directly from the tray-bar icon of your antivirus suite. To do this, simply right-click on it and look for an option that will allow you to disable the real-time protection. If this is not applicable to your particular scenario since you’re using the default security suite (Windows Defender), you will need to temporarily uninstall the real-time protection from the Windows Security menu in order to avoid the Access Violation error. Here’s a quick guide on how to do this: In case the same problem is still occurring, move down to the next potential fix below.

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