This was part of the error: " java.lang.NullPointerException at com.codegym.task.task07.task0708.Solution.main(Solution.java:20) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)" I have no clue what it means, and there's no simplification of the error at the top of the coding page. Can anyone explain why I'm getting this error? Thanks!