NCoverexplorer task

The following simple merge task:

<ncoverexplorer program="ncoverexplorer.console.exe"

reportType="None"

mergeFileName="ncoverOutputMerged.xml" >

</fileset>

</ncoverexplorer>

Generates following error:

           [ncoverexplorer] Arguments: /r:None /s:"ncoverOutputMerged.xml" /c:
NAnt.NCoverExplorer.config" "C:\Darek\Aufgaben\CI\ccnet\Config\testproj1_build\
coverOutput-ClassLibrary1.dll.xml" "C:\Darek\Aufgaben\CI\ccnet\Config\testproj1
build\ncoverOutput-SVNTest.dll.xml"
            [ncoverexplorer] Starting 'ncoverexplorer.console.exe (/r:None /s:"
coverOutputMerged.xml" /c:"NAnt.NCoverExplorer.config" "C:\Darek\Aufgaben\CI\cc
et\Config\testproj1_build\ncoverOutput-ClassLibrary1.dll.xml" "C:\Darek\Aufgabe
\CI\ccnet\Config\testproj1_build\ncoverOutput-SVNTest.dll.xml" )' in 'C:\Darek\
ufgaben\CI\ccnet\Config\testproj1_build'
            [ncoverexplorer] -----------------------------------------
            [ncoverexplorer]     NCoverExplorer.Console 1.3.5.1872
            [ncoverexplorer]     (c) 2006 Grant Drake
            [ncoverexplorer]     http://www.ncoverexplorer.org/
            [ncoverexplorer] -----------------------------------------
            [ncoverexplorer] Using .config file: NAnt.NCoverExplorer.config
            [ncoverexplorer] Cannot find configuration file specified: NAnt.NCo
erExplorer.config
            [ncoverexplorer] Deleting config file: NAnt.NCoverExplorer.config

BUILD FAILED

Directory of ncoverexplorer.console is in the Windows path (I tried also specyfying absolute path, but with no result). It seems as if NCoverExplorer task should generate some .config file, but it doesn't...

The task is almost literally copied/pasted from the example. What's wrong here?