Instance Failure Error Plz Help how to solve it

Question

I am  getting Instance failure error in two places in two pages
1st palce when i m filling dataadpter values to dataset Exact location is


da.fill(ds,"tables");
At the tables ..i.e ..dataset table name is showing the Instance failure error .
How to resolve this error. but the syntax is not wrong as per  my  opnion...


and 2nd place is con.open()
i had declared the con object and i passed string as toooooooo.
i don't no what it could be the problem...........


How to solve these Instance failure errors