I want to load in MOF instance the UML 1.4 specification. 
So I downloaded the 01-02-15_Diff.xml and 01-02-15.xml 
(they are in the same directory).
The problem is when I import the 01-02-15_Diff.xml into 
MOF instance the parser generates this error:

javax.jmi.xmi.MalformedXMIException: 
java.lang.NullPointerException
        at org.netbeans.lib.jmi.xmi.XMISaxReaderImpl.read
(XMISaxReaderImpl.java:77)
        at org.netbeans.lib.jmi.xmi.XMISaxReaderImpl.read
(XMISaxReaderImpl.java:59)
        at 
org.netbeans.modules.mdrexplorer.looks.reflect.actions.Load
XMIAction$1.run(LoadXMIAction.java:111)
        at org.openide.util.Task.run(Task.java:136)
[catch] at org.openide.util.RequestProcessor$Processor.run
(RequestProcessor.java:599)
==>
Annotation: XMI parsing error at line 6: 
java.lang.NullPointerException
java.lang.NullPointerException
        at org.netbeans.lib.jmi.xmi.XmiSAXReader.endElement
(XmiSAXReader.java:241)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1536)
        at org.apache.crimson.parser.Parser2.content
(Parser2.java:1779)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1507)
        at org.apache.crimson.parser.Parser2.content
(Parser2.java:1779)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1507)
        at org.apache.crimson.parser.Parser2.content
(Parser2.java:1779)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1507)
        at org.apache.crimson.parser.Parser2.parseInternal
(Parser2.java:500)
        at org.apache.crimson.parser.Parser2.parse
(Parser2.java:305)
        at org.apache.crimson.parser.XMLReaderImpl.parse
(XMLReaderImpl.java:442)
        at javax.xml.parsers.SAXParser.parse(Unknown 
Source)
        at org.netbeans.lib.jmi.xmi.XmiSAXReader.read
(XmiSAXReader.java:116)
        at org.netbeans.lib.jmi.xmi.XmiSAXReader.read
(XmiSAXReader.java:97)
        at org.netbeans.lib.jmi.xmi.XMISaxReaderImpl.read
(XMISaxReaderImpl.java:71)
        at org.netbeans.lib.jmi.xmi.XMISaxReaderImpl.read
(XMISaxReaderImpl.java:59)
        at 
org.netbeans.modules.mdrexplorer.looks.reflect.actions.Load
XMIAction$1.run(LoadXMIAction.java:111)
        at org.openide.util.Task.run(Task.java:136)
[catch] at org.openide.util.RequestProcessor$Processor.run
(RequestProcessor.java:599)
==>
java.lang.NullPointerException
        at org.netbeans.lib.jmi.xmi.XmiSAXReader.endElement
(XmiSAXReader.java:232)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1536)
        at org.apache.crimson.parser.Parser2.content
(Parser2.java:1779)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1507)
        at org.apache.crimson.parser.Parser2.content
(Parser2.java:1779)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1507)
        at org.apache.crimson.parser.Parser2.content
(Parser2.java:1779)
        at org.apache.crimson.parser.Parser2.maybeElement
(Parser2.java:1507)
        at org.apache.crimson.parser.Parser2.parseInternal
(Parser2.java:500)
        at org.apache.crimson.parser.Parser2.parse
(Parser2.java:305)
        at org.apache.crimson.parser.XMLReaderImpl.parse
(XMLReaderImpl.java:442)
        at javax.xml.parsers.SAXParser.parse(Unknown 
Source)
        at org.netbeans.lib.jmi.xmi.XmiSAXReader.read
(XmiSAXReader.java:116)
        at org.netbeans.lib.jmi.xmi.XmiSAXReader.read
(XmiSAXReader.java:97)
        at org.netbeans.lib.jmi.xmi.XMISaxReaderImpl.read
(XMISaxReaderImpl.java:71)
        at org.netbeans.lib.jmi.xmi.XMISaxReaderImpl.read
(XMISaxReaderImpl.java:59)
        at 
org.netbeans.modules.mdrexplorer.looks.reflect.actions.Load
XMIAction$1.run(LoadXMIAction.java:111)
        at org.openide.util.Task.run(Task.java:136)
[catch] at org.openide.util.RequestProcessor$Processor.run
(RequestProcessor.java:599)
==>

What must I do?
PS: I'm using the latest version of MDR.

Regards, Beatriz