Can not restore backup file in Linux Debian

HI,

I got a problem when I am trying to restore services desk from backup. Please help me on below error. I am running it on Linux Debian7.

Details of error
Exception in thread "main" java.lang.UnsatisfiedLinkError: /root/ManageEngine/ServiceDesk/jre/lib/amd64/xawt/libmawt.so: libXtst.so.6: cannot open shared object file: No such file or directory
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(Unknown Source)
        at java.lang.ClassLoader.loadLibrary(Unknown Source)
        at java.lang.Runtime.load0(Unknown Source)
        at java.lang.System.load(Unknown Source)
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(Unknown Source)
        at java.lang.ClassLoader.loadLibrary(Unknown Source)
        at java.lang.Runtime.loadLibrary0(Unknown Source)
        at java.lang.System.loadLibrary(Unknown Source)
        at sun.security.action.LoadLibraryAction.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.awt.NativeLibLoader.loadLibraries(Unknown Source)
        at sun.awt.DebugHelper.<clinit>(Unknown Source)
        at java.awt.Component.<clinit>(Unknown Source)
Could not find the main class: com.adventnet.servicedesk.tools.RestoreDialog. Program will exit.

Thanks,