<!--- Please do not ask questions or create discussion in the bug tracker. Use https://nukkitx.com -->
<!--- ONLY POST ISSUES WITH A CLEAN SERVER ON THE LATEST VERSION -->
## Generated Bug Report

<!--- DO NOT OPEN A ISSUE IF THIS IS A PLUGIN ERROR -->
PLUGIN ERROR: TRUE

### Expected Behavior
<!--- What would you expect to happen -->


### Actual Behavior
<!--- What actually happened -->


### Steps to Reproduce
<!--- Reliable steps which someone can use to reproduce the issue. Please do not create issues for non reproducible bug! -->


### OS and Versions

* Nukkit Version: 1.0dev
* Git Commit Abbrev: 566c097
* Java Version: Java HotSpot(TM) 64-Bit Server VM (1.8.0_91-b14)

* Host Configuration:

| Item | Value |
|:----:|:-----:|
| Host OS | Linux-amd64 [3.16.0-4-amd64] |
| Memory(RAM) | 33.0 GB |
| Storage Size | 66.6 GB |
| Storage Type | Disk 0:(avail=58.6 GB, total=66.6 GB)  |
| CPU Type | UNKNOWN |
| CPU Core Count | 8 |

### Crashdump, Backtrace or Other Files

```
java.lang.UnsupportedClassVersionError: io/pocketvote/PocketVote has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at cn.nukkit.plugin.PluginClassLoader.findClass(PluginClassLoader.java:44)
	at cn.nukkit.plugin.JavaPluginLoader.getClassByName(JavaPluginLoader.java:141)
	at cn.nukkit.plugin.PluginClassLoader.findClass(PluginClassLoader.java:40)
	at cn.nukkit.plugin.PluginClassLoader.findClass(PluginClassLoader.java:28)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at cn.nukkit.plugin.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:47)
	at cn.nukkit.plugin.PluginManager.loadPlugin(PluginManager.java:95)
	at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:268)
	at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:132)
	at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:124)
	at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:120)
	at cn.nukkit.Server.<init>(Server.java:426)
	at cn.nukkit.Nukkit.main(Nukkit.java:99)

```