Hi VAT,
Thank you for your interest in Syncfusion products.We are unable to reproduce the mentioned error while opening the XML document which was already saved in MS Project. Could you please update us your input XML document and Essential Studio Version which you have used at your end to reproduce the mentioned error? Thereby we will analyze further and update you with an appropriate solution.
Please let us know if you have any other questions.
Regards,
Divyalakshmi V