Critical

UnsupportedClassVersionError — wrong Java version

Example error line

java.lang.UnsupportedClassVersionError: com/example/Plugin has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0

Cause

The server or mod JAR needs a newer Java version than the runtime currently provides.

Fix

Use the matching Java version — on our hosting the right one is selected automatically per Minecraft version.

Learn more

Get your own crash report analyzed

Paste your full crash report or log excerpt into our analyzer and get an instant diagnosis for every pattern it recognizes.

Go to the Crash Report Analyzer

Ready for a more stable server?

Choose the right game server and review its resources, settings, and final monthly price before ordering.

Minecraft Java · Configure now

Related errors

java.lang.OutOfMemoryError: Java heap space fix
GC overhead limit exceeded — Java memory error explained
Server watchdog timeout — why your Minecraft server crashes

Back to the Crash Report Analyzer