SmoothScroll in RubyMine #2

gistfile1.txt

Plugin 'SmoothScroll' failed to initialize and will be disabled.  Please restart RubyMine.

com.intellij.diagnostic.PluginException: com/hccampos/smoothscroll/SmoothScrollPlugin : Unsupported major.minor version 51.0 [Plugin: SmoothScroll]
    at com.intellij.ide.plugins.cl.PluginClassLoader.b(PluginClassLoader.java:130)
    at com.intellij.ide.plugins.cl.PluginClassLoader.a(PluginClassLoader.java:77)
    at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:66)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:249)
    at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:408)
    at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:398)
    at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.access$000(ComponentManagerImpl.java:384)
    at com.intellij.openapi.components.impl.ComponentManagerImpl.a(ComponentManagerImpl.java:107)
    at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:89)
    at com.intellij.openapi.project.impl.ProjectImpl.init(ProjectImpl.java:307)
    at com.intellij.openapi.project.impl.ProjectManagerImpl.a(ProjectManagerImpl.java:278)
    at com.intellij.openapi.project.impl.ProjectManagerImpl.newProject(ProjectManagerImpl.java:231)
    at com.intellij.platform.PlatformProjectOpenProcessor.doOpenProject(PlatformProjectOpenProcessor.java:170)
    at com.intellij.ide.RecentDirectoryProjectsManager.doOpenProject(RecentDirectoryProjectsManager.java:59)
    at com.intellij.ide.RecentProjectsManagerBase$MyAppLifecycleListener.appStarting(RecentProjectsManagerBase.java:351)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:114)
    at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:228)
    at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:219)
    at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:209)
    at com.intellij.util.messages.impl.MessageBusImpl.access$000(MessageBusImpl.java:43)
    at com.intellij.util.messages.impl.MessageBusImpl$1.invoke(MessageBusImpl.java:131)
    at com.sun.proxy.$Proxy37.appStarting(Unknown Source)
    at com.intellij.idea.IdeaApplication.c(IdeaApplication.java:294)
    at com.intellij.idea.IdeaApplication.access$500(IdeaApplication.java:56)
    at com.intellij.idea.IdeaApplication$IdeStarter$2.run(IdeaApplication.java:261)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:346)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)
    at java.awt.EventQueue.access$400(EventQueue.java:82)
    at java.awt.EventQueue$2.run(EventQueue.java:676)
    at java.awt.EventQueue$2.run(EventQueue.java:674)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)
    at com.intellij.ide.IdeEventQueue.e(IdeEventQueue.java:696)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:524)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:335)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.UnsupportedClassVersionError: com/hccampos/smoothscroll/SmoothScrollPlugin : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:471)
    at com.intellij.util.lang.UrlClassLoader._defineClass(UrlClassLoader.java:189)
    at com.intellij.util.lang.UrlClassLoader.defineClass(UrlClassLoader.java:185)
    at com.intellij.util.lang.UrlClassLoader._findClass(UrlClassLoader.java:161)
    at com.intellij.ide.plugins.cl.PluginClassLoader.b(PluginClassLoader.java:124)
    ... 48 more