[Python] ImportError: No module named six

I'm trying to build OpenERP project, done with dependencies. It's giving this error now

Traceback (most recent call last):
File "openerp-client.py", line 105, in <module>
File "modules\__init__.pyo", line 23, in <module>
File "modules\gui\__init__.pyo", line 22, in <module>
File "modules\gui\main.pyo", line 33, in <module>
File "rpc.pyo", line 29, in <module>
File "common\__init__.pyo", line 22, in <module>
File "common\common.pyo", line 26, in <module>
File "tools\__init__.pyo", line 28, in <module>
File "dateutil\relativedelta.pyo", line 12, in <module>
ImportError: No module named six


Could someone guide what's wrong and how it can be fixed???

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