Historical Accuracy

How important is historical accuracy to you in a novel? I waver. If the writing is good, I tend to forgive errors. But if there are problems with the story, I will notice every inaccuracy. I suppose I'm more stringent on books which take place in eras I am familiar with. But I'm not one to hurl a book for one mistake. I also put a higher standard to multi-published authors than newbies like when I'm judging a contest. Maybe that's not fair, but if you are a historical novelist, it is part of your job to produce a book as close to accurate as possible, in my humble opinion. What about you?