virt-manager runing error on CentOS 7

I try to run virt-manager on a CentOS 7 desktop and get the following menssage:

Traceback (most recent call last):
File "/usr/share/virt-manager/virt-manager", line 35, in <module>
from virtinst import util as util
File "/usr/share/virt-manager/virtinst/__init__.py", line 89, in <module>
from virtinst.distroinstaller import DistroInstaller
File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 23, in <module>
from . import urlfetcher
File "/usr/share/virt-manager/virtinst/urlfetcher.py", line 34, in <module>
import requests
ImportError: No module named requests

There is a solution for this error?