[developers] PET referencing undefined letterset

[Stephan Oepen]

hi zhengbo,

> I am not sure whether there is any problems in the grammar or the
> flopping process or in the parsing process.  Any one can give any
> hint?

the ERG requires a different version of PET; see:

  http://lists.delph-in.net/archive/developers/2006/000434.html

if you are a tad patient, i would recommend you just wait until a new
(merged) release of PET becomes available for public download.  if you
are in a hurry, you would have to install the older `oe' branch (see
the PET pages in the DELPH-IN wiki).

                                                       cheers  -  oe

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