FIXED Yamler Error

18:11:42 [WARNING] Plugin performed restricted action, please inform them to use proper API methods: Illegal thread group access
java.security.AccessControlException: Plugin violation: Illegal thread group access
    at net.md_5.bungee.BungeeSecurityManager.checkRestricted(BungeeSecurityManager.java:39)
    at net.md_5.bungee.BungeeSecurityManager.checkAccess(BungeeSecurityManager.java:62)
    at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:315)
    at java.lang.Thread.init(Thread.java:391)
    at java.lang.Thread.init(Thread.java:349)
    at java.lang.Thread.<init>(Thread.java:548)
    at net.cubespace.Yamler.Metrics.start(Metrics.java:212)
    at net.cubespace.Yamler.YamlerPlugin.onEnable(YamlerPlugin.java:14)
    at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(PluginManager.java:217)
    at net.md_5.bungee.BungeeCord.start(BungeeCord.java:239)
    at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:50)
    at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15)