Weird error

[The_Waffleman211]

When I go to play Voltz it says this:

Stack Trace:

Exception: EOFException

Message: null

Trace:

java.util.zip.GZIPInputStream.readUByte(Unknown Source)

java.util.zip.GZIPInputStream.readUShort(Unknown Source)

java.util.zip.GZIPInputStream.readHeader(Unknown Source)

java.util.zip.GZIPInputStream.<init>(Unknown Source)

java.util.zip.GZIPInputStream.<init>(Unknown Source)

org.spoutcraft.diff.JBPatch.bspatch(JBPatch.java:94)

org.spoutcraft.launcher.util.MinecraftDownloadUtils.patchMinecraft(MinecraftDownloadUtils.java:62)

org.spoutcraft.launcher.util.MinecraftDownloadUtils.downloadMinecraft(MinecraftDownloadUtils.java:50)

org.spoutcraft.launcher.UpdateThread.updateMinecraft(UpdateThread.java:325)

org.spoutcraft.launcher.UpdateThread.runTasks(UpdateThread.java:129)

org.spoutcraft.launcher.UpdateThread.run(UpdateThread.java:109)

Someone help!