open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,
I am trying to get the HYCOM data using convertHYCOM.py script.
I tried it once and it worked. But when I tried that for the second time the convertHYCOM.py script tuned to 0 KB file without any script written in it. I copy the script and run it again and it is giving me the following error:

C:\opentelemac-mascaret\v8p0r2\scripts\python27\converters>convertHYCOM.py --from 2013-08-24 --stop 2018-08-31 --bl 48,-54 --tr 49,-53 -r hycom-2m.slf
Traceback (most recent call last):
File "C:\opentelemac-mascaret\v8p0r2\scripts\python27\converters\convertHYCOM.py", line 41, in <module>
from pydap.client import open_url
File "C:\opentelemac-mascaret\v8p0r2\scripts\python27\converters\pydap\client.py", line 17, in <module>
from pydap.proxy import *
File "C:\opentelemac-mascaret\v8p0r2\scripts\python27\converters\pydap\proxy.py", line 10, in <module>
from pydap.util.http import request
File "C:\opentelemac-mascaret\v8p0r2\scripts\python27\converters\pydap\util\http.py", line 5, in <module>
import httplib2
ImportError: No module named httplib2


It seems some of the modules also were deleted. I would be thankful if you could help me to solve the problem.

Thanks