Slick2D Test Files Not Working / Compiling

I have tried google but no luck, often I want a break from learning things from scratch and have a crack at Slick2D library, I want to look and load the test files but when I try to load something like… AnimationTest.Java it says:

Exception in thread “main” java.lang.Error: Unresolved compilation problem:

at slick.tutorial.AnimationTest.main(AnimationTest.java:100)

Which is this line:

100: public static void main(String[] argv) {

I’ve tried alsorts but this should ideally work? it has the main method, no other errors. I just want to be able to load up examples and learn from it.

Thanks