Appreciate you inputs.
I called a local lawyer ten minutes ago and he suggested me to:
1. Go to the court clerk office to describe the issue, which is a clear mistake( the plantiff laid and there is no signed contract between both parties for $2500.00 deal), to ask for a 'motion to open' action.
2. Or, hire a lawyer to do it for me.
I will try to handle it myself and see how it goes.
I will update you and this board for the progress, no matter what kind of result I will get, so that someone later may learn something from it.
I don't have a right word to express my thanks to you and this forum.