ser_1419280648049

Technic Launcher Error Report:
( Please submit this report to https://github.com/TechnicPack/TechnicLauncher/issues )
    Launcher Build: 439

    Selected Pack: Vanilla
Stack Trace:
    Exception: ClassFormatError
    Message: Unknown constant tag 33 in class file java/util/concurrent/TimeUnit$7
    Trace:
        java.util.concurrent.TimeUnit.<clinit>(Unknown Source)
        org.jdesktop.swingworker.SwingWorker.getWorkersExecutorService(Unknown Source)
        org.jdesktop.swingworker.SwingWorker.execute(Unknown Source)
        org.spoutcraft.launcher.skin.components.AnimatedBackground.setVisible(AnimatedBackground.java:98)
        org.spoutcraft.launcher.skin.components.AnimatedBackground.changeIcon(AnimatedBackground.java:61)
        org.spoutcraft.launcher.skin.components.BackgroundImage.changeBackground(BackgroundImage.java:57)
        org.spoutcraft.launcher.skin.ModpackSelector.redraw(ModpackSelector.java:130)
        org.spoutcraft.launcher.skin.ModpackSelector.redraw(ModpackSelector.java:213)
        org.spoutcraft.launcher.skin.ModpackSelector.updatePack(ModpackSelector.java:120)
        net.technicpack.launchercore.install.AvailablePackList.triggerUpdateListeners(AvailablePackList.java:58)
        net.technicpack.launchercore.install.AvailablePackList$3$1.run(AvailablePackList.java:186)
        java.awt.event.InvocationEvent.dispatch(Unknown Source)
        java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        java.awt.EventQueue.access$200(Unknown Source)
        java.awt.EventQueue$3.run(Unknown Source)
        java.awt.EventQueue$3.run(Unknown Source)
        java.security.AccessController.doPrivileged(Native Method)
        java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
        java.awt.EventQueue.dispatchEvent(Unknown Source)
        java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        java.awt.EventDispatchThread.run(Unknown Source)

System Information:
    Operating System: Windows 7
    Operating System Version: 6.1
    Operating System Architecture: x86
    Java version: 1.7.0_55 32 bit
    Total Memory: 46 MB
    Max Memory: 247 MB
    Memory Free: 12 MB
    CPU Cores: 4