The key error is likely that it's wanting to use the active key for the actual transaction but you only have the posting wif loaded. I haven't looked at the code, but if you have it loaded from the wallet, add both keys to the wallet, if you care calling it this way: `Hive(keys=[posting_key])` you should do it `Hive(keys=[posting_key, active_key])`

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Also, the beem library is dated, which is why I have taken upon myself to update it and get it caught up with the times under a rebrand. If you would like to use my current iteration, it's listed as hive-nectar and is mostly 1:1 compatible with beem, just `from nectar.hive import Hive` etc instead of beem. Feel free to reach out if you would like.