GanttProject doens't lunch after installation

j’ai installer GanttProject et il ne s’ouvre pas qu’on je clique sur l’icone d’application rien n’apparait

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I installed GanttProject and it doesn’t open when I click on the application icon, nothing appears.

There is a number of discussions on this forum that address this issue. Most likely, you have an incompatible Java Runtime on your system and you need to uninstall it, unless it is really needed. However, there are other possible reasons, e.g. Astrill VPN is known to conflict with Java