Failed to list downloaded Vaadin versions


i use eclipse ee luna, tomcat 7, vaadin 7, maven 3.2
when i try to make a new Vaadin 7 project i get this error,
in the error log i have this error: Failed to get cached list of available Vaadin versions
i’ve read the other post and tried all the solutions, restarting eclipse, restarting the pc, etc.

how can i solve this error?


it was a problem with the internet connection,
i’m connecting through proxy so my user and password was not saving in the secure storage file,
the solution: eclipse-window-preferences- in the search box write secure… - content and down right corner delete
everything will be reseted and after, the user and password will be remember in the file

hope will help other, it took me some time to figure it out

happy coding