mate! it's no big deal! there are so many variables in flying and murphy's law is bound to catch up with you once in a while! so don't take it too hard on yourself!
in any case, you might know your stuff, but when the check instructor is sitting by your side, it's easy to get nervous and mess up even the most basic stuff.
i remember when i was training, each night before any big check i would be
bricks!
so take it easy, have a beer and give it your best shot the next time! good luck!
