Reinstalling the server
Install your server's files again when it stops starting, or wipe it completely and start from scratch.
The client panel is available in Polish only, so this article gives its labels in Polish with a translation the first time they appear. The panel has two options for repairing and resetting a server. Zreinstaluj serwer (Reinstall server) downloads the files needed to start it again, but keeps your data, such as the world and configuration. Wyczyść serwer (Wipe server) deletes every file. Both are in the Przegląd (Overview) tab, in the Informacje o serwerze (Server information) section.
Before you start
Make a backup. A reinstall may delete or change some files, and a wipe can't be undone.
Reinstalling
This helps when the server stopped starting because of damaged startup files, or after changing the server's version or type.
Open the reinstall window
In the client panel, open your server and in the Przegląd tab click Zreinstaluj serwer.
Confirm
Click Tak, zreinstaluj (Yes, reinstall). The panel stops the server and shows the Trwa instalacja serwera (Server installation in progress) screen until it finishes.
Start the server
After the installation, the server is stopped. Start it in the Przegląd tab.
After a reinstall, the world, configuration and logs stay in place. The startup files are downloaded again, and their previous versions may be kept with a .old ending, such as server.jar.old. You can delete those files once the server works properly.
Clean installation
If the server should look as if you'd just ordered it, wipe it first and then reinstall it.
Wipe the server
In the Przegląd tab, click Wyczyść serwer and confirm with Tak, wyczyść (Yes, wipe). The panel stops the server and deletes every file.
Reinstall the server
Click Zreinstaluj serwer and confirm, as in the section above.
Common problems
The server doesn't run after a reinstall
A reinstall leaves the server stopped. Start it in the Przegląd tab. If it still won't start, check the last lines in the Konsola (Console) tab.
Some files are still on the server after a wipe
Check the list in the Pliki (Files) tab after a minute. If the files are still there, delete them in the file manager: tick everything with the checkbox next to the path and click Usuń (Delete). Please also let us know through the contact form.