Unable to launch Vcenter Call "ServiceInstance.RetrieveContent" for object "ServiceInstance" on Server "vcenter" failed
Product 4.x
If you are trying to open the VC via IP then check for below link
http://www.techiesweb.com/vmware-vsphere-error-call-serviceinstance-retrievecontent-for-object-servi...
If not then can you please put up a snapshot for the error