While running simulations, after the first 15k blocks or so, this kind of error starts to happen, even though actors have a large coinbase behind them. This probably is a btcwallet bug but i am opening it here for now.
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Yes it's a double-spend problem, sorry for just posting the error. I mentioned the size of coinbase because i think it would be more reasonable to happen if a btcwallet doesn't have any other funds (UTXOs) to send except these it just received from another transaction.
changed the title
-4: -22: TX rejected: transaction [...] in the pool already spends the same coinsJul 23, 2014