Follow the steps mentioned below (take a look at the last point).
- First run sub-report individually without calling from main report. If it show output means there is no error in sub-report.
- If 1st step execute successfully, then for time being disable or delete sub-report and run main report, Check weather if it shows output successfully.
- If you fail in 1st step means there is some problem in sub-report.
- If you fail in 2nd step means sub-report is working fine, problem with main report.
- If 1st and 2nd step run successfully then make sure you have pass parameter properly between reports.
- If Pre filtering is enabled in your reports delete the Default filter of modified on last 30 days filter in both main report and sub report.
