报错求助

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63980 [Thread-4] ERROR com.fs.starfarer.combat.CombatMain  - java.lang.NoClassDefFoundError: com/thoughtworks/xstream/XStreamException
java.lang.NoClassDefFoundError: com/thoughtworks/xstream/XStreamException
        at com.fs.starfarer.title.Object.updateContinueButtonState(Unknown Source)
        at com.fs.starfarer.title.Object.??O000(Unknown Source)
        at com.fs.starfarer.title.Object.<init>(Unknown Source)
        at com.fs.starfarer.title.B.<init>(Unknown Source)
        at com.fs.starfarer.title.TitleScreenState.createUI(Unknown Source)
        at com.fs.starfarer.title.TitleScreenState.prepare(Unknown Source)
        at com.fs.starfarer.BaseGameState.traverse(Unknown Source)
        at com.fs.state.AppDriver.begin(Unknown Source)
        at com.fs.starfarer.combat.CombatMain.main(Unknown Source)
        at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.thoughtworks.xstream.XStreamException
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 11 more
原版无mod