The way close cash report works has been changed. Please make these changes for getting close cash report work.
To improve close cash performance, it has been made to load only required reports on close cash. Please make this change when upgrading to 3.8 U2.
Administrator Menu > Maintenance > Resources
Create a new resource CloseCash.Reports and add below lines:
SALES_BY_ATTRIBUTE; SALES_BY_PROPERTY; SALES_BY_USER; PAYMENTS_CARD; PAYMENTS_CHEQUE; PAYMENTS_CURRENCY; PAYMENTS_CUSTOMER; PAYMENTS_VOUCHER; REMOVED_LINES; SALES_RETURNS; SALES_PRODUCTS; SALES_RECEIPTS; SALES_DELIVERY; STOCK_DIARY;
Here each line represent a report, for which data is populated when loading close cash screen. You can increase close cash performance by removing the lines corresponding to the reports which are not used in close cash report.