Unable to open a file with in a grails project using Groovy/Grails Tool Suite

I am using Groovy/Grails Tool Suite and when ever i try to create a new grails project or import an existing projectg i get this error enter image description here

and when i try to open a file with in the project the editor throws an error and the file doesn't show up , it looks like this enter image description here

any suggestions about what the problem is and how to solve it would be appreciated