Could anyone help resolve it?

I am trying import test cases from MS Word document to RQM with RQMWordImport3.0.1, and set a case category to Function， but always show "Object reference not set to an instance of an object" error.

My cfg file:
 
testscript.DOCStart="1."
testscript.dc:title=Table("Product").A4
testscript.dc:descrition=Table("Product").A4

testscript.steps.title=Table(2).B
testscript.steps.type="execution"
testscript.steps.description=Table(2).B
testscript.steps.name=Table(2).B
testscript.steps.expectedResult=Table(2).C

testcase.dc:title=testscript.dc:title
testcase.dc:description=testscript.dc:descrition
testcase.dc:creator=Table("Product").A3

testcase.category term="Function".value=Table("Product").A3

Error information details：

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at Mso2Rqm_Common.PreferenceStore.combinePreferences()
   at Mso2Rqm_Common.ArtifactFactory.createArtifacts(String configFile, Document document)
   at RQMWordImport.WordExportFileDialog.handleExportToFile(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5448 (Win7SP1GDR.050727-5400)
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
RQMWordImporter
    Assembly Version: 1.0.4465.14981
    Win32 Version: 1.0.4465.14981
    CodeBase: file:///C:/Program%20Files%20(x86)/IBM/RQMWordImporter/RQMWordImporter.dll
----------------------------------------
Extensibility
    Assembly Version: 7.0.3300.0
    Win32 Version: 7.00.9466
    CodeBase: file:///C:/windows/assembly/GAC/Extensibility/7.0.3300.0__b03f5f7f11d50a3a/Extensibility.dll
----------------------------------------
Microsoft.Office.Interop.Word
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.4518.1014
    CodeBase: file:///C:/windows/assembly/GAC/Microsoft.Office.Interop.Word/12.0.0.0__71e9bce111e9429c/Microsoft.Office.Interop.Word.dll
----------------------------------------
Mso2Rqm_Common
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///C:/Program%20Files%20(x86)/IBM/RQMWordImporter/Mso2Rqm_Common.DLL
----------------------------------------
office
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.4518.1014
    CodeBase: file:///C:/windows/assembly/GAC/office/12.0.0.0__71e9bce111e9429c/office.dll
----------------------------------------
System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5446 (Win7SP1GDR.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5453 (Win7SP1GDR.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
Accessibility
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll
----------------------------------------
CustomMarshalers
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_32/CustomMarshalers/2.0.0.0__b03f5f7f11d50a3a/CustomMarshalers.dll
----------------------------------------
System.Xml
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Configuration
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Web
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.5456 (Win7SP1GDR.050727-5400)
    CodeBase: file:///C:/windows/assembly/GAC_32/System.Web/2.0.0.0__b03f5f7f11d50a3a/System.Web.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

Refer link: https://jazz.net/wiki/bin/view/Main/RQMExcelWordImporter#Document_Configuration