Playing around in my home lab over the last couple of months I carried out an installation of vCenter Operations Manager (vCOPS), had a look around it and then promptly deleted the vApp after a month or so.
Spring forward a couple of months and going through the new vROPS 6 installation and going through the vCenter registration process with vROPS 6 I received the following error message.
Because this installation isn’t actually replacing an existing instance I decided against overriding the existing registration and decided to go with a de-registration, thereby allowing a fresh registration of vROPS 6.
Using the MOB incorrectly can lead to you breaking your vCenter server so please do so carefully.