The go.get needs an url to an instance but you are passing in only the instance hash itself.
Try
pprint(go.get(msg.url(newtile), “passable”))
Think of id’s as (and it actually is) a hash of only the object:
eg
hash: [/instance0]
meanwhile an url could really a combination of socket and hashes
url: [main:/instance0]
Hope it will help you out.