Comments by Ovie Prince Tegaton (Top 3 by date)

Did you use breakpoints to check which line is bringing the error, or to know what values are passed to each objects and variable? This error needs your own attention by stepping-in to your code with breakpoint. I believe you will find it

Your question is not constructive enough to produce an answer from anyone. Pls state clearly what you are trying to do, how and why.