XNA 4.0 and C# programmer needed (1562971)

I am need of someone with great skills in XNA 4.0 and C# for this project, anyone who do not have these two skills by default is disqualified. I am making a game and have achieved great deal in development with it. The problem I have is when I added the title screen and from the title screen to go to the game I get an error, null error. Here is what I need to be done: 1) Debug and remove the error when the person clicks on Play Game, it crashes with an error. I will explain more about the error in either PM or when the person is hired. 2) Add an AI for my monster. I will explain more through PM or when the person is hired. 3) Debug another bug in the game when the player goes all the way down to the bottom of the screen, the screen scrolling stops until the character goes up at a certain destination before the scrolling continues. 4) Another bug when the beetle eats the leave it suppose to poop a dung, but I am unable to get the dung to appear at the back of the beetle, when moving, I need this bug to be fixed. If you have any questions or concerns please do not hesitate to contact me, I need this to be finished maximum in a week, no later. ## Deliverables I required that you have experience in game development. Someone with portfolio will be hired over someone wihout portfolio. You must have excellent experience in C# and XNA 4.0 and and excellen problem solver. I require portfolio and reference to your previous work. People with positive feedback will be given preference over people with no feedback, people with lots of negative feedback will be disqualified immediately. Sending my game to determine the problem before hiring will be done only by request and with a person who have lots of high positive feedback.