The following command works fine for when a language model is specified. 
Deleting the line KENLM lazyken=0 name=LM0 factor=0 path=$PWD/blm.en order=3
 causes the script to fail with error:


ERROR: Failed to run '/pathtomoses/mosesdecoder/bin/moses  -config 
/pathtodata/binarised/moses.ini -show-weights'. at 
/pathtomoses/mosesdecoder/scripts/training/mert-moses.pl line 1744.


#########################
### MOSES CONFIG FILE ###
#########################

# input factors
[input-factors]
0

# mapping steps
[mapping]
0 T 0

[distortion-limit]
6

# feature functions
[feature]
UnknownWordPenalty
WordPenalty
PhrasePenalty
PhraseDictionaryCompact name=TranslationModel0 num-features=4 
path=/pathtodata/binarised/phrase-table input-factor=0 output-factor=0
LexicalReordering name=LexicalReordering0 num-features=6 
type=wbe-msd-bidirectional-fe-allff input-factor=0 output-factor=0 
path=/pathtodata/binarised/reordering-table
Distortion
KENLM lazyken=0 name=LM0 factor=0 path=/pathtodata/blm.en order=3

# dense weights for feature functions
[weight]
# The default weights are NOT optimized for translation quality. You MUST tune 
the weights.
# Documentation for tuning is here: 
http://www.statmt.org/moses/?n=FactoredTraining.Tuning
UnknownWordPenalty0= 1
WordPenalty0= -1
PhrasePenalty0= 0.2
TranslationModel0= 0.2 0.2 0.2 0.2
LexicalReordering0= 0.3 0.3 0.3 0.3 0.3 0.3
Distortion0= 0.3
LM0= 0.5

 /pathtomoses/mosesdecoder/scripts/training/mert-moses.pl 
-no-filter-phrase-table true.fr true.en /pathtomoses/mosesdecoder/bin/moses 
binarised/moses.ini --mertdir /pathtomoses/mosesdecoder/bin/
<http://www.hoang.co.uk/hieu>
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