unknown error, unable to create Template Variable (TV)

hi, I am unable to create a TV on my office PC, though it is working in my laptop..
below is the error when i submit a new TV request..

"$rs not set! New variable not saved!"

please help me out to solve this ..
thanks in advance.

I found the solution at

http://modxcms.com/forums/index.php/topic,4573.0.html

thanks community