Bug Error message when accessing calendar

I've been trying to access the calendar page but keep getting the following error message:


vBulletin Message

Magna_Graecia, you do not have permission to access this page. This could be due to one of several reasons:

1. Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
2. If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.

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The message occurs when I try to access the calendar through the drop down menu at the bottom of a post ride.

When trying to access the calendar through the link on the main page (calendar actions), the main page just refreshes.