I got the same error, from an invocation of autopano-sift by Hugin.

In the package autopano-sift (2.4-0ubuntu8), the executable is called
autopano. Using the default settings, Hugin
(0.7.0~svn3191+beta5-1ubuntu1) expects it to be called autopano-sift.
After changing Hugin's preferences, it calls:

autopano --maxmatches 20 /tmp/ap_resjyB4Iq
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-1.jpg"
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-2.jpg"
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-3.jpg"
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-4.jpg"
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-5.jpg"
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-6.jpg"
"/home/sybren/2008/20080926-Utrecht/hdr1/jpeg/hdr1-7.jpg"

The program output reads:

autopano-sift, Automatic panorama generation program

Loading keyfiles
ex: System.Xml.XmlException: Text node cannot appear in this state.  Line 1, 
position 1.
  at System.Xml.XmlTextReader.ReadText (Boolean notWhitespace) [0x00000]
  at System.Xml.XmlTextReader.ReadContent () [0x00000]
  at System.Xml.XmlTextReader.Read () [0x00000]
  at System.Xml.XmlReader.MoveToContent () [0x00000]
  at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadRoot () 
[0x00000]
  at System.Xml.Serialization.XmlSerializer.Deserialize 
(System.Xml.Serialization.XmlSerializationReader reader) [0x00000]

Unhandled Exception: System.NullReferenceException: Object reference not set to 
an instance of an object
  at MultiMatch.LoadKeysets (System.String[] filenames) [0x00000]
  at Autopano.Main (System.String[] args) [0x00000]

I would expect the default Hugin preferences to simply work with the
Ubuntu packages.

-- 
autopano null value at MultiMatch.LoadKeysets
https://bugs.launchpad.net/bugs/162575
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