I’ve experienced this error on both VMware VCSA 6.7.x and VCSA 7.x:
Failed to deploy OVF package ThrowableProxy.cause A general system error occured

OVF

Heres how to work around this problem:
1. Disable any HTTP or HTTPS proxy set in the VMware Appliance Management > Networking > Proxy.
2. Browse to all hosts fqdn manually and accept the SSL certificate in the browser your using.
3. Disable any proxy setting in your web browser. I was using Firefox.

The OVF deployment will be succesful. This was tested on the newest version of VCSA 7 (7.0.3.01300 to be exact).