Trying to import XMI 1.2/ UML 1.4 from Visual Paradigm

Hi,
 
I'm trying to import XMI 1.2/ UML 1.4 from Visual Paradigm and I need a
little help. I'm using Argo 0.24.
I chose to ignore unsupported diagrams from the preferences window, but
I still get an error:
 
XMI format error : org.argouml.model.XmiException:
javax.jmi.xmi.MalformedXMIException:
org.netbeans.lib.jmi.util.DebugException: Error creating literal
'pk_final'. Probably invalid literal name for enumeration
PseudostateKind 

I tried to find 'pk_final' with a text search in the XMI file, but it's
not there. I'm not familiar with XMI, so I'm not sure where to look and
how to fix it.

Best wishes,
 Vasile RUS