Solved JVMCFRE003 Bad Major Version?

Hello,

Whenever I run plugin I keep getting this error, this is my first time seeing this error:

Error (open) Error (close)

HTML:

[ERROR] Could not load 'plugins/MyPlugin.jar' in folder 'plugins'

org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version; class=me/mrgriefer/myplugin/Main, offset=6

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:139) ~[spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:394) ~[spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:301) [spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadPlugins(CraftServer.java:353) [spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:210) [spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:784) [spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_212]

Caused by: java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version; class=me/mrgriefer/myplugin/Main, offset=6

at java.lang.ClassLoader.defineClassImpl(Native Method) ~[?:1.8.0_212]

at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:391) ~[?:1.8.0_212]

at java.lang.ClassLoader.defineClass(ClassLoader.java:360) ~[?:1.8.0_212]

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_212]

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:163) ~[spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:96) ~[spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:946) ~[?:1.8.0_212]

at java.lang.ClassLoader.loadClass(ClassLoader.java:891) ~[?:1.8.0_212]

at java.lang.ClassLoader.loadClass(ClassLoader.java:874) ~[?:1.8.0_212]

at java.lang.Class.forNameImpl(Native Method) ~[?:1.8.0_212]

at java.lang.Class.forName(Class.java:403) ~[?:1.8.0_212]

at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot-1.15.2.jar:git-Spigot-a99063f-fad2494]

... 6 more

 

@MrGriefer_ I found these after a quick search:
https://stackoverflow.com/questions...vmcfre003-bad-major-version-in-websphere-as-7
https://www.ibm.com/support/pages/apar/JR46369
https://stackoverflow.com/questions...nerror-jvmcfre003-bad-major-version-class-org

 

Obviously I would've not created this thread before searching my error and for some reason none of these worked for me, but I've managed to fix my issue by just re-installing Eclipse. Thank you for your help!

 

Some people do and you didn't mention that you already did.

Good to know.