There could issue in running instance of VMware Vcenter server service and web management service.
Just try the below steps to resolve this issue:
- Stop the VMware VirtualCenter Server service and the VMware VirtualCenter Management Webservices.
- Remove the wrong entry from the proxy.xml file. The correct entry depends on your configuration.
- Restart the VMware VirtualCenter Server service and the VMware VirtualCenter Management Webservices.