create composite object from a geometry from mesh.....

Hello,

I imported a quite complex triangular mesh ( a real soil pore) . I created the geometry from the mesh with comsol. And then I could do simulation, remesh etc ....
It works quite well ...

But now, I'm trying to make a parallelepiped in such a way that my pore is enclosed in my parallelepiped ...
and I can't mesh the both separateley ....
I can't do the intersection between the both ....

all the time, I have the error :
error : 2100
internal error in geometry decomposition

Exception:
com.femlab.jni.FlNativeException: Internal error geometry decomposition
Messages:
Internal error geometry decomposition

Stack trace:
at csg3edg.cpp, row 1181, ()
at com.femlab.geom.Geom.comp(Native Method)
at com.femlab.geom.Geom.g(Unknown Source)
at com.femlab.geom.Geom.comp(Unknown Source)
at com.femlab.geom.JGeom.comp(Unknown Source)
at com.femlab.commands.GeomCompCmd.o(Unknown Source)
at com.femlab.commands.GeomCompCmd.evalOnServer(Unknown Source)
at com.femlab.commands.FlCommand.runServerCode(Unknown Source)
at com.femlab.server.ServerProxy.eval(Unknown Source)
at com.femlab.commands.FlCommand.a(Unknown Source)
at com.femlab.commands.FlCommand.eval(Unknown Source)
at com.femlab.commands.a.a(Unknown Source)
at com.femlab.gui.actions.DrawOperationAction.booleanOperation(Unknown Source)
at com.femlab.gui.dialogs.DrawCompositeDlg.applyAction(Unknown Source)
at com.femlab.controls.FlDialog.okAction(Unknown Source)
at com.femlab.controls.FlDialog.actionPerformed(Unknown Source)
at com.femlab.controls.FlButton.a(Unknown Source)
at com.femlab.controls.FlButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.KeyboardManager.fireBinding(Unknown Source)
at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)
at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at com.femlab.gui.e.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

I don't know what I can do .....
If someone has an idea .....
thank you very much.

Marie