Hi Jisha
I’ve managed to reproduce the exception in PC with Windows 7 64bit and in PC with Windows XP 32bit.
I am using Syncfusion 8.2.0.18.
You can see my steps to reproduce the exception in attached archive - Import_xlsx.png file
I also included the file that I tried to import - data_M1.xlsx
Regards, Sergey
Import_xlsx_953ad572.zip