Eclipse does not display my project files on project explorer

Question

When I double click on any project (go into) in project explorer it won't open, to display my project content, this problem happened after installing glassfish tools on eclipse for the server. I wanted to know where i can find out what the error is that causing me the strange behavior.

Before I double click on my project:

After I double click on my project :

my project is not empty !!

before installing glassfish i had jboss tools 4.0 and spring tools 4, when everything works fine but when i added glassfish i got this error (that I show the top) i tried to reset eclipse and install glassfish tools at the beginning without the other two to see will it give me another error, it worked without error but when I try to install spring tools 4 it gives me this error