[developers] PET referencing undefined letterset

[Zhengbo Zhou]

Hi All,

I am using pet-0.99.11 and the latest version of ERG.  Firstly I flopped the grammar and then using the produced english.grm in the cheap parser.  But the parser seems not to recognize any word ending with 's' (inflectional words like gives or even normal words like gas).  Here is some sample:

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[root at localhost cheap]# ./cheap -packing -verbose=0 -default-les english.grm
something
reading `pet/english.set'... including `pet/common.set'... `pet/global.set'...
loading `english.grm' (LinGO (Jan-06)) reading ME model `rondane.mem'... [11846 features]
58789 types in 3.1 s
He goes to school
Referencing undefined letterset !o
He went to school
(2) `he went to school' [0] --- 2 (0.01|0.02s) <37:106> (1080.1K) [0.0s]
He go to school
(3) `he go to school' [0] --- 0 (-0.00|0.02s) <37:109> (1038.1K) [0.0s]

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?

Sincerely

Zhengbo Zhou