[glade--] terminate called

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Hi,
I've run into a small issue, with 'glade--'.  I've got a Glade project
which is going to be written in C++.  The program builds fine, for a C
project.  When I try to build the source for C++, a dialog box opens
with the message: "Error running glade-- to generate the C++ source code.
Check that you have glade-- installed and that it is in your PATH.
Then try running 'glade-- <project_file.glade>' in a terminal."
Glade-- is installed, I've checked.  Running the glade-- program from a
shell yeilds:
enigma@delta ~/src/shiftcipher $ glade-- shiftcipher-2.glade
terminate called after throwing an instance of 'std::out_of_range'
  what():  encoding
Aborted

So it could quite possibly be that I've just done something stupid.  But
can anyone see anything I could have done wrong?
The glade file can be found at
http://www.strudel-hound.com/shiftcipher-2.glade


Thanks

Will

(Versions: glademm V2.0.0.1, Gnome glade-2 2.6.8)
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