Hi Nutan,
Thank you for additional information. Actually, if you look at your document one more time, you will see that there are two text columns, and the table has only one column. So TableStart and TableEnd mergefield are in different rows, which is not allowed. That is why the exception is thrown. I modified your template. Please see the attached document.
Best regards,
Alexey Noskov
Developer/Technical Support
Aspose Auckland Team