The controls may be built dynamically, if it is a table element, like <tr>, <td>, you need to use "Design Table" to define the table schema match rule.

A little more information would be helpful.  What type of control is it?  What matching rules are you using?  Can you show us the code you are using to access the control?

The controller is a simple text box and the match rule I am using is List web controls, I am highlighting the text box by using the filter <input type=text> and It remains in idle state foreever if I use IsCreated or WaitForCreate, even aster control is rendered on the browser.

I have attached screeshots below.

The exception you are receiving just indicates that you are attempting to use a control that has not been created (matched).  Matching happens at more than one level - controls higher in the heirarchy have to match for the controls beneath them to match , so you should look at all of your match rules.  Start at the page level and work your way down to the textbox.  Remember, match rules must uniquely match the control to ensure that you match the correct control.  Also, you need to wait on the last control created in the hierarchy for the best results.  This usually requires a WaitForCreate on the page before you can operate on the controls on the page.

Can you share a screenshot of your page heirarchy?

Hey Jeff,

I started from the Main page and then tab level , finally searched for the desired control using filter and highlight/add control.

I have attached the screenshot of heirarchy below.

Also can you let me know what should be the input value for cell property of SetCellValue control. I am trying to give a1 , but its throwing a error saying invalid cell.

The control is in Search_ALL/ main1/PSearchBRCSection.... path

I would check the match rules on main1 and see if that is matching at runtime.  I suspect there is a matching issue with that control and that would prevent your control from matching.