Hi Navin,
Thank you for using Syncfusion products.
We are unable to reproduce the reported issue at our side. We have tried the sample at our side to reproduce the above reported issue by importing the data table and saveas method and we are not able to see any issues at our side with that sample.
We have attached the sample for your reference.
Please try the sample at your side and let us know if these helps you. If you still face the issue, please get back to us with the simplified sample and the stack trace for the reported error.
Please let me know if you require any further clarifications.
Thanks,
Sridhar.S
SaveAs_786ae38f.zip