Need help with assetsend for SPT bridging

I’m following the guide at HOWTO: Provision the Bridge for Your NEVM ERC-20 and I am stuck on 4a because i get this:

error code: -6
error message:
Must specify -assetindex to be able to spend assets

I know it’s gotta be something simple in a conf file or something. I’m on Ubuntu BTW running syscoin 4.3