The most common cause of the JNI error while trying to set up a Minecraft server is due to the Java version installed on the machine being outdated.

To fix this issue, you’ll need to install the latest JDK (Java Development Kit). However, if the problem still occurs, there is a possible solution to address this problem as well.

Fix Minecraft Error A JNI error has occurred, please check your installation and try again on Windows 11/10 PC, by following these solutions.

If you want to download and install Java JDK 18 on Windows 11/10 computer, you will also have to set up a Path in Environment Variable.