Hey guys i have a problem in reffering a library on eclipse. Dont know if adding or referring but here maybe the picture will explain it.

Well this is the library i am trying to use, it is andengine which i download from github. But everytime i add a library on my sample project click apply then close it. The opening it again to check f it is realy applied and has the green check it. But it shows this.

What is the problem here? it shows the x mark even though my project and the library are in the same workspace. Please help. Anyone know how to fix this? thank you..
When you are adding the project to the workspace make sure that you check the box ‘copy into workspace’