Hello! I've gotten myself a Canon Rebel XTI off a friend and the pics are great! The only problem i'm having is a certain error i've been getting. Now i've read the manual about the settings and modes and it doesn't seem to help me much. I'm sorry in advance if this is a noob question. Sometimes when taking pictures i get the error: This picture is not shootable, please turn camera off then on, or re-install the battery. I'm wondering if this is coming up because i'm not using the right setting for the situation or something? It seems to happen quite a bit. I'll go to take a pic and it'll come up, so sometimes i'll move the dial a few times and the picture will finally take, with me standing in the exact same position and everything. Just moving the dial over 1 at a time. Does my camera need service or is there just something wrong with the battery or is it just my ignorance? If it is me just using the wrong setting for the situation ... is there somewhere i can see the criteria for each? Anyways any help would be greatly appreciated!