Hello. This seems to be a peculiarity of your server/hosting. Try doing the same on your own local machine, the plugin will compile and start without any problems after restarting the server.
For some reason, at the moment when plugins are being compiled, the "serverinstance" property is missing in the "WipeTimer" class, and not just "null", but completely absent, even though it does exist on normal servers. Because of this, the plugin fails to compile and doesn't load.
However, after your server fully starts, the "serverinstance" property appears and the plugin compiles without any issues.
I also recommend contacting your hosting provider's tech support and asking why the "serverinstance" property is missing in the "WipeTimer" class during plugin compilation, and how exactly the server startup process works on their side. Is it the standard procedure, or have they modified something?