Thanks for your posting and using Aspose.Cells.
Please add the JAI library in your class path and see if it resolves your issue. You need to add the following jar files in your class path.
Thanks for the answer. I got rid from the exception.
Thanks for your feedback and using Aspose.Cells.
It is good to know that you were able to sort out this issue. Let us know if you encounter any other issue, we will be glad to look into it and help you further.