I have faced the below issue by trying to deploy an .ovf exported VM (6.5 build 10964411 vCenter)
After validation, the below error appears.
The solution is to upload/import the .ovf from a single host UI and not vCenter server and then migrate your VM in your vApp/host/cluster needed.
Please try to deploy template without selecting menifest file
You are right. I tried without selecting manifest file and BANG. It worked. Thanks big time.