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lemmatizer is not working in CGI Python using lampp serevr

Hello,
I am working on a simple lematization program. The program is effectively working on local machine with the terminal and python interpreter. but when i do the same program with CGI Python on my localhost web serevr LAMPP, it does not working. Tokenaizer is working perfectly but lematization is not working. Please help me.

My Code:
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#!/usr/bin/python

from nltk.tokenize import sent_tokenize, word_tokenize, RegexpTokenizer
from nltk.stem import WordNetLemmatizer


print "Content-type:text/htmlrnrn"

lemmatizer = WordNetLemmatizer() #Not working

text = "Appu is a better student in MCA, University campus, calicut university"
print text

#RegexpTokenizer will work with ragular expression
tokenizer = RegexpTokenizer('w+')
words=tokenizer.tokenize(text)

for ws in words:
print ws
print '<br>'

#open file
lemmaFile=open("lemmaFile.txt","w")
#writing into file
for w in words:
lemmaFile.write(lemmatizer.lemmatize(w, pos="a")) #not Woking
lemmaFile.write("t") Not Working


#close file
lemmaFile.close()

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Thank you.