Null Reference Exception

TudoGIFsAdesivosMemes
a cartoon character with the words object reference not set to an instance of an object below him
a black background with the word error in red
a black and gold circle with a diamond on it
a man in a suit is standing in a room with the words null reference exception behind him
a man in a blue shirt is sitting at a table eating food and drinking a drink .
a computer screen with a fatal error message on it
a blurry picture of a windows logo on a blue background .