error when installing plugin on eclipse galilio

[Sherif Shehab]

Hi Guys ,
I'm trying to install a plugin on eclipse galillio but this error occurs

 An error occurred while installing the items
  session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.provisional.p2.engine.phases.Install, operand=null --> [R]com.quantum.Quantum 3.3.0, action=org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.InstallBundleAction).
  Error while loading manipulator.
  Error while loading manipulator.
   

i tried many times but still the same , any solution for this