Unable to Post an Ad

I recently posted an Ad and everything seems to go fine until I submit it. After submitting the ad, I get an error message that states it is lost in and inaccessible. I just recently communicated with a long time member/user of this website. All was done on Astromart. I purchased a telescope from him and everything went smoothly. I even gave him a rating, so I know my account is active and functioning. Can someone please help?