How To Fix "Unable To Access Jar File" - Minecraft Server

Seeing the dreaded “Unable to Access Jar File Minecraft server” message can be frustrating when all you want is to get your world running. This error often appears as soon as you try to start the server, leaving you stuck at the console instead of building and exploring.

The issue usually points to something going wrong with the jar file setup, the directory, or the way your bat file calls the game. Understanding why this happens is the first step to getting your Minecraft server back online.

What Is The Error "Unable To Access JarFile"?

The “Unable to Access Jar File” error usually means the jar file isn’t in the same folder as the bat file, or the Java command was written incorrectly. This error occurs when the path is missing, the file was edited, or the directory is incorrect.

This is an example of the “Unable to Access JarFile” error

How To Fix The "Unable To Access Jar File" Error

• The Jar File is not uploaded to the correct directory. Make sure you've uploaded it to the same directory as the old .jar file.

• Attempt to re-upload the .jar file; if it is still unsuccessful, that means the jar file is corrupted.

• Make sure to use the exact name of the old .jar file.

• If you still encounter this issue. Please get in touch with us here

Still have some questions about fixing the "Unable to Access Jar File" error?

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Updated on: 18/09/2025