Issue :
VirtualMachine.MountToolsInstaller" for object " on vCenter Server . vix error code = 21011
cause :
The problem occur while VM is not able to map the VMware tools from the ESXi server.
Solution :
1. Open ESXi -- COnfiguration -- Security Profile -- Click on SSH -- Option -- Start the SSH service
2. Open Winscp and connect with the ESXi server
3. Go to vmfs/volumes/5371................./packages/5.5.0/VMtools
4. Download Windows.iso to any datastore which is connected with the esxi server.
5. Go to VM Console and map the windows.iso image in the CD ROM
6. Install / upgrade the VMware Tools
7. Restrat the machine
8. Go back to ESXi --- COnfiguration -- Security Profile --choose SSH -- Stop the service.
Now, Problem is solved.