If you face below error message related to report preview in eZee FrontDesk OR eZee Burrp anytime, Kindly set financial period from eZee Configuration and eZee POS Back Office. It will resolve this error.
FD : eZee Configuration
>> Advance Settings >> Rental >> Financial
POS Back Office : eZee POS
Back Office >> eZee Icon >> Options >>
Financial >> Financial Period.