This error occurs when the table has foreign keys, I used localdata to fill the grid
PSPavithra Subramaniyam Syncfusion Team June 24, 2019 01:36 AM
Thanks for contacting Syncfusion support.
We have analyzed the reported exception and we would like to inform that this is not a Grid related issue and that this is a general issue of the Newtonsoft. So we have found some general solution for this “Self referencing loop” issue you can find that solutions in the below link.