Yesterday, I tried to install opscenter and initiated import of existing DSE 5.0 cluster. It failed with certain errors which pointed out that installed version was not opscent
I also met the same problem. But opscenter 6.0 cannot start using the solution above.
Checking out the support platfrom list, I think it is because my os is CentOS 6.2, which is not in the support list.
So I just use version 5.2 and it works fine.