XBR: combined buyer+seller delegate

[oberstet]

I've spent an hour trying to create a combined XBR buyer+seller delegate (using SimpleBuyer and SimpleSeller), but failed.

one (unrelated) issue I ran into is this #471

I got stuck on this not very revealing error:

Running on Autobahn 19.9.2 xbr: 19.9.3
WAMP session connected: { x_cb_node_id: null,
  realm: 'realm1',
  authid: 'team3',
  authrole: 'team3',
  authmethod: 'ticket',
  authprovider: 'static',
  authextra:
   { x_cb_node_id: null,
     x_cb_peer: 'tcp4:80.150.203.100:60172',
     x_cb_pid: 28945 },
  roles:
   { broker: { features: [Object] },
     dealer: { features: [Object] } },
  transport:
   { type: 'websocket',
     url: 'wss://continental2.crossbario.com/ws',
     protocol: 'wamp.2.cbor' } }
Buyer has started, remaining balance in active payment channel is 300 XBR
Seller has started, remaining balance in active paying channel is 1000 XBR
6975655884179954
ERR Error {
  error: 'crossbar.error.no_such_object',
  args:
   [ 'no payment channel at address
"b"O\\x85\\x00\\xd8\\x8d\\xd7\\xe6\\xe1\\xcd\\x8e\\x18_\\xf5\\xbe\\xe3F\';\\xd3\\xa7""'
],
  kwargs: {} }
Error {
  error: 'crossbar.error.no_such_object',
  args:
   [ 'no payment channel at address
"b"O\\x85\\x00\\xd8\\x8d\\xd7\\xe6\\xe1\\xcd\\x8e\\x18_\\xf5\\xbe\\xe3F\';\\xd3\\xa7""'
],
  kwargs: {} }