install errors on Centos-7.2 Linux

Downloading tarball signature securely...
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "<string>", line 670, in main
File "<string>", line 655, in run_installer
File "<string>", line 627, in download_and_extract
File "<string>", line 619, in get_tarball_info
File "<string>", line 578, in get_https_resource_securely
File "<string>", line 487, in __init__
File "/usr/lib64/python2.7/httplib.py", line 1182, in __init__
context.load_cert_chain(cert_file, key_file)
ssl.SSLError: [SSL] PEM lib (_ssl.c:2757)

is there a known solution? All advice welcome!

thanks in advance.