SmoothScroll in RubyMine #1

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.access$300(ProjectManagerImpl.java:82)
    at com.intellij.openapi.project.impl.ProjectManagerImpl$9.compute(ProjectManagerImpl.java:562)
    at com.intellij.openapi.project.impl.ProjectManagerImpl$9.compute(ProjectManagerImpl.java:558)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$4.run(ProgressManagerImpl.java:240)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$TaskRunnable.run(ProgressManagerImpl.java:464)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$6.run(ProgressManagerImpl.java:274)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178)
    at com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171)
    at com.intellij.openapi.application.impl.ApplicationImpl$10$1.run(ApplicationImpl.java:642)
    at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:420)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:695)
    at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:150)
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)
    ... 31 more