[Red Hat Satellite 6] Importing ansible roles fails with the error: "RestClient::InternalServerError: 500 Internal Server Error"

Issue

• Importing ansible roles from Satellite Server web interface fails with the following error:

RestClient::InternalServerError: 500 Internal Server Error
/opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.1/lib/restclient/abstract_response.rb:223:in `exception_with_response'
/opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.1/lib/restclient/abstract_response.rb:103:in `return!'
/opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.1/lib/restclient/request.rb:809:in `process_result'
/opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.1/lib/restclient/request.rb:725:in `block in transmit'
/opt/rh/rh-ruby24/root/usr/share/ruby/net/http.rb:877:in `start'