Hi, can somebody explain me what is this? I'm trying to send my blacbytes from freebee and getting this:

This error is explained in the wiki as smart contract conditions not fulfilled. So have a look at the smart payment freebe created in your wallet, something seems to be wrong there!
might be a suggestion for tony to make errors less programatic by nature and more human readable based on fail condition. would go a long way to increasing user friendliness. humans make a lot of mistakes at the best of times
That is true. Most programmers tend to focus on what happens when things go well, rather than when what happens when things go wrong. But Byteball has one of the best UIs amongst the various alts. There definitely is a focus on user-friendliness.