ansible安装后运行报错cryptography

[root@kazihuo ~]# ansible all -m ping

ERROR! Unexpected Exception, this is probably a bug: (cryptography 0.8.2 (/usr/lib64/python2.7/site-packages), Requirement.parse('cryptography>=1.1'))

[root@kazihuo ~]# rpm -qa |grep python-crypto

[root@kazihuo ~]# yum -y remove python-cryptography

[root@kazihuo ~]# yum -y install ansible