VIRL - Talking to External Network - Issue with Flat Network

Trying to get one of my VIRL VM routers to connect to my physical network. Got  VIRL running in a VM on Windows 10 host machine. The private network on host machine is 192.168.1.0/24. Want devices on this network to be able to access my VIRL VM router. Created a VMNet2 interface in Virtual Network Editor and bridged it to  physical NIC on the host. 

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Done the following to  virl.ini file: 

## Second flat connection (AKA flat1) 
 ## Physical Port and virtual bridge for L2 bridge
 l2_port2_enabled: True
 ## Default is enabled
 l2_port2: eth2
 
 ## l2 network  (AKA flat1)
 ## l2_network format is address/cidr format x.x.x.x/x
 l2_network2: 192.168.1.0/24
 l2_mask2: 255.255.255.0
 l2_network_gateway2: 192.168.1.1
 
 ## l2 bridge first and last address for dhcp allocation
 
 l2_start_address2: 192.168.1.200
 l2_end_address2: 192.168.1.255
 
 ## address on the second L2 bridge port for debugging?
 ## Default is
 l2_address2: 192.168.1.254/24 

Did the 'vinstall rehost'. It ran fine with no errors. Rebooted the VIRL VM. 

Launched VM Maestro and created a one-node IOSv topology. Added a 'flat-1' connection. By default, it is putting 'flat-1' into the management network range of 172.16.1.0/24.

Selected 'flat-1' and added a new extension with a key value of "host_network" and a value of "flat1" . When trying to run the simulation get the following error:

(ERROR) [Nov/05/2015 14:02:22] Failed to start session "My_Topologies@test2-NTzBpc": Exactly 1 subnet needed for public FLAT network "flat1"

How to get the flat1 network to be within the 192.168.1.0/24 network.

Please check this thread as the issue appears to be similar : ARP Reply / FLAT Network - 97656 - The Cisco Learning Network

Or check the below Document

 Configuring_External_Connectivity_with_Cisco_VIRL-v1.pdf - 30508 - The Cisco Learning Network