Assign Port Group to VM. I am getting error.

Hello,

I am using vro 7.

As you know there is workflow named "Connect virtual machine NIC number to distributed virtual port group" in vRO. When you run this workflow, you must choose which port group will be assigned to specified vm.

But ,I dont want to use input value for "dvPortgroup". I want to send "dvPortgroup" value via script object. i am getting this error.

Unable to convert object, 'test (dvSwitch)' plugin unexcepted exception : Bad type syntax 'string'

How can i fix this issue ?