Create version fails with "An internal system exception occurred: Could not load url from ...... null"

[#1]

With Ambari 2.6.0 or 2.5.x version if you try to use 2.6.3 ( http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.4.0/HDP-2.6.4.0-91.xml) or 2.6.4 -) http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.3.0/HDP-2.6.3.0-235.xml ) VDF files, it fails to load/parse the files - would see below error in the logs.f

"like An internal system exception occurred: Could not load url from http://public-repo-1.hortonworks.com/HDP/centos7/2.x/updates/2.6.4.0/HDP-2.6.4.0-91.xml. null"

Those VDF files has GPL tag URLs and these ambari versions can't understand it - hence fails with the above error. You can consider Upgrading the Ambari to 2.6.1 or later versions.

If you want to continue using 2.6.0 or earloer Ambari versions then you may have to create private repo and download GPL binaries and work without GPL tags in VDF file. you can contact Hortonworks support for any further help.