Ansible Unit Test installation error

When I run the following command

pip3 install -r ./test/runner/requirements/units.txt

The softwares get installed but in the setup steps I get the following error

failed with error code 1 in /tmp/pip-build- /pycrypto

Also is there a way to skip already successfully run steps and jump to the step in question?

Thanks

The command follows the step described in the Ansible documentation
http://docs.ansible.com/ansible/latest/dev_guide/developing_modules_general.html#unit-testing