SQL Error in X-Cart & Can't login to backend of X-Cart

I have been getting emails from my X-Cart site like this "Date : 08-Jun-2010 10:43:51 Site : http://www..[login to view URL] Request URI : /[login to view URL] Remote IP : [login to view URL] Logged as : SQL query : SELECT * FROM xcart_products_lng WHERE code='US' AND productid=16361 union select count(*),1,2,concat((select login from xcart_customers where usertype=0x50 limit 1),floor(rand(0)*2)) x from xcart_customers group by x Error code : 1222 Description : The used SELECT statements have a different number of columns Backtrace : /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/[login to view URL] " "Date : 23-May-2010 07:34:40 Site : http://www..[login to view URL] Request URI : /[login to view URL] Remote IP : [login to view URL] Logged as : SQL query : SELECT * FROM xcart_products_lng WHERE code='US' AND productid=16361 union select count(*),1,2,3,concat((select login from xcart_customers where usertype=0x50 limit 1),floor(rand(0)*2)) x from xcart_customers group by x Error code : 1062 Description : Duplicate entry 'master1' for key 1 Backtrace : /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/include/[login to view URL] /home/physical/public_html/[login to view URL] " Also when I try and login to the /admin part of the site the screen is just blank and no login screen. Orders are still coming through the website as normal. I need this fixed ASAP. I have replaced my domain with above.