The program generates an empty report

The problem may occur due to several reasons:

You have not selected sections to include into the report.
A report should include at least one section. Make sure you have selected at least one section to include into the report.
You have specified an incorrect report period.
If no requests have been made during the dates you have provided - certainly nothing will be printed in the report. Make sure you have specified the correct report period.
You have not specified the report objects
It is impossible to generate a report when no report objects are selected. Make sure you have selected at least one item in the list of objects to generate the report for.
No requests with the specified object were made.
If you select a report object that has not generated any requests - the report will come out empty. For instance, if you would like to generate a report 'By months' and have selected only January while the database has information starting in February - certainly, the report will come out empty. Make sure you have selected the correct objects you would like to generate the report for.