Vin4er

It usually helps to print out values of variables when debugging. In this case, I suspect one of appid, contextid, or assetid is undefined or not the value you are expecting.

Data types shouldn't matter. The module should convert everything internally for you. Are you absolutely sure you're using asset IDs which are owned by the account you're logged into? Maybe you mixed up some accounts?

Your asset ID is still wrong.

Yes, the assetid is the "id" property there.