GSTR4

GSTR4 offline utility is not working properly when I type purchase invoices the json file is didn't taking too many purchase invoices.For example I prepare ofline utility for 100 invoices in 4A&B the json file didn't generate and its shown error report also at the same time i filed only 6 th table it's generated properly and correctly . Its defenetly technical problem.Is there any solution please assist me