Why is Farmtown on Facebook having errors?

That’s something you’ll have to ask them.

A few reasons.

One, it’s a Zynga game, they’re notorious for shitting out games because their business model is basically get people hooked on a game then offer them money to spend less time playing it/getting better tools etc.

Two, it’s a Facebook game. You simply don’t make a lot of money on them, thus you can’t hire high quality people to fix problems instantaneously.

Three, no one here can really truly explain why they are having errors, but beyond that, what good would it serve you to find out? I can still play the game perfectly fine, though I do see their error message on top.