[pet] syntax error

[Sergio Roa]

Hello,

I am using the following command trying to run some initial tests with pet and 
I get the following errors:

[sergior at elf erg]$ cat ~/input.txt | cheap -limit=10000 -mrs=xml english.grm
reading `pet/english.set'... including `pet/common.set'... `pet/global.set'...
loading `english.grm' (LinGO (Nov-06)) reading ME model `jhpstg.mem'... syntax 
error in jhpstg.mem:6.15 - got `6790', expecting `mem' section
unexpected character '{' in jhpstg.mem:26.34

unexpected character in input
69132 types in 3.5 s
(1) `this is a test' [10000] --- 1 (0.01|0.02s) <20:124> (1547.7K) [0.0s]
derivation[1] (0):this is a test

<rmrs cfrom='-2' cto='-2'>
</rmrs>

What could be the reason for such syntax error?

Thanks,

Sergio.