One of two things could be happening. First, if you have recently replaced a lost OneCard and then later found your old/original OneCard and are trying to use it, it will not work. After a OneCard has been replaced, the old/original card is deleted from the system. A deleted card will no longer work anywhere on campus. The second problem might be an issue you are having with the OneCard office. They can be reached at 815-753-9569 or through the OneCard office website.