A runtime error is caused by an error within a program’s code. This is a problem at the programmers end, not yours. What usually happens is that you (or the software) do something unexpected and the program doesn’t know how to handle it. When someone creates a piece of software, they try to anticipate every possible scenario. Unfortunately, that’s next to impossible and sometimes you end up with bugs, including runtime errors. So, what do you do if you get one of these runtime errors? Contact the program vendor and let them know.