Error “Service unavailable” when posting a solution here in techyv.com

Hi, everytime I submit a solution to a question here at techyv.com, It gives back an error saying "Service unavailable". How do I solve this problem? What did I do wrong? Please help me. Answering questions here at techyv.com helps me to improve my understand of a lot of things and also helps other people of their problems. Can you give a detailed solution for this?
Thanks in advance,
Ickyrr
