Who has this problem? Is there a good way to describe a class or group of users? It doesn't have to be a fully developed "persona," it can be a specific person as long as that person is representative or individually important to the reason you're making the software.
What are they trying to do when they encounter the problem? Think about it, see if you can come up with more than one thing, write them down.
Why are they trying to do that? What are they trying to _accomplish,_ beyond the task?