Win $26000 Sweepstakes

Good evening, 

I have been noticing the  Win $26,000 Sweepstakes and I decided to give this a try.  However, after several attempts, the error message comes up as "Bad Request"  I see the rules for entering the sweepstakes but there is no way to actually  ENTER.  

Please advise the solution for this occurrence.    I, for one, would like to participate in these contests that AARP offers. 

Thank you, 

Karen D Jennings