cannot create support ticket - URL No Longer Exists

i tried to create ticket, clicked in the menu Support - Create a ticket then forwarded to salesforce web https://do-support.force.com/s/sso-error?ErrorCode=REGISTRATION_HANDLER_ERROR

<table cellspacing=“10”><tbody><tr><td><span style=“font-weight: bold; font-size: 12pt;”>URL No Longer Exists</span></td></tr><tr><td>You have attempted to reach a URL that no longer exists on salesforce.com.<br><br>You may have reached this page after clicking on a direct link into the application. This direct link might be:<br>• A bookmark to a particular page, such as a report or view<br>• A link to a particular page in the Custom Links section of your Home Tab, or a Custom Link<br>• A link to a particular page in your email templates<br><br>If you reached this page through a bookmark, you are probably trying to access something that has moved. Please update your bookmark.<br><br>If you reached this page through any of the other direct links listed above, please notify your administrator to update the link.<br><br>If you reached this page through a link on our site, please <a href=“https://do-support.force.com/cases/logabug.jsp”>report the broken link directly to our Support Team</a> and we will fix it promptly. Please indicate the page you were on when you clicked the link as well as any other related information. We apologize for the inconvenience.<br><br>Thank you again for your patience and assistance. And thanks for using salesforce.com!</td></tr></tbody></table>