I think that is the vehicle additions pack mod that causes that, or maybe tanks(blaze mod?).
I’m fairly new and this was the first error I ever saw, and the one I still get on a daily basis. I went on the CDDA discord help channel to ask about it as well as made a post on Reddit, before finding this forum I believe, and was told to just ignore it, that it’s not a big deal.
I get it all the time, and believe it has to do with turrets. It seems to happen if a vehicle with a turret comes inside your reality bubble, but that is just my guess. Something with the ammo not being fed properly and you have to manually reload, but again I’m not 100% sure, but seems ignoring it is fine for now.
edit: https://www.reddit.com/r/cataclysmdda/comments/671x6r/weekly_questions_thread_april_23_2017/dgnn6n8/?context=3
I get the one you show, but also get a 1155 error, like in the post I linked above.
I hope linking to Reddit threads is OK on this forum, if not I am sorry and can remove the links.