ok i figured out the problem !!
this is what happened, well when i logged onto the site I refreshed the page and a ‘page has expired message’ showed up as normal’ so I clicked back on the browser, this had caused the error message shown above to be shown and I couldn’t access the site at all.
so I fixed the problem by login in from another computer, but my account actually seemed no to exist anymore, (the password wasn’t working’ so I just refreshed the password and hey! Now I can access the site from this computer again.
guess my account or IP address got locked or something from the site.