Description of problem: When submitting the form for launching an instance via Horizon the following error shows up: Danger: There was an error submitting the form. Please try again. Version-Release number of selected component (if applicable): python-django-horizon-2015.1.2-3.el7ost.noarch How reproducible: 100% Steps to Reproduce: 1. Deploy 7.1 overcloud 2. Start update procedure to 7.2 3. Once the update is done go to Horizon 4. Launch an instance Actual results: Danger: There was an error submitting the form. Please try again. Expected results: The forms gets submitted and instance is launched. Additional info: In httpd logs: "POST /dashboard/project/instances/launch HTTP/1.1" 500 30351 "http://172.16.23.10/dashboard/project/instances/"
*** This bug has been marked as a duplicate of bug 1287621 ***