My elements disappeared :C

I have a problem, yesterday I worked all day on some elements for a mod, the problem is that when I come today and open the program are no more, literally there is nothing, and when I try to build or start the client gives me error, I have a problem in which also gecko lib jumps me as there is an update available, telling me that I have is 6.0.2, and that I update to 6.0.2, and as you understand that makes no sense and I do not know if this related, the elements are in the project folder, but simply do not appear, the resources appear to load and everything, but nothing of the elements. 


Attached are the screenshots and the errors I found. Thanks in advance