After fresh installation of vcenter server 6.0 ( all components on single virtual machines) I got this error.
I saw vpxd (vcenter) service was stopped I tried to restart it bu got below error.
Solution:- I changed it delay restart and restart web client service ( that was also stopped) after 1-2 minutes vpxd started it self.
Now I am able to logon through web client ( it also take 5-10 minutes for initializing )