If you encounter a problem with the DHIS2 software you can ask for assistance on the developer's mailing list at https://launchpad.net/~dhis2-devs. Before reporting, make sure that you have:
Cleared the web browser cache (also called history or browsing data) completely (select all options before clearing).
Cleared the DHIS2 application cache: Go to Data administration -> Cache statistics and click Clear cache.
If you believe you have found a bug you can report it either to the developer mailing lists or to the bug tracker at https://bugs.launchpad.net/dhis2 .
For the developers to be able to help you need to provide as much useful information as possible:
DHIS2 version: Look in the Help -> About page inside DHIS2 and provide the version and build revision.
Web browser including version.
Operating system including version.
Servlet container / Tomcat log: Provide any output in the Tomcat log (typically catalina.out) related to your problem.
Web browser console: In the Chrome web browser, click F12, then "Console", and look for exceptions related to your problem.
Actions leading to the problem: Describe as clearly as possible which steps you take leading to the problem or exception.
Problem description: Describe the problem clearly, why you think it is a problem and which behavior you would expect from the system.