Hello, I recently created a Spigot MC server for a community I am a part of. The person I made it for insists on it being updated to 1.15.2, but I have no idea how, I followed the tutorial that i'll be given by all of you, https://www.spigotmc.org/wiki/buildtools/, yet I still get this message. In ~/buildtools, it's there, squared. I have no clue how to get my server updated to 1.15.2, if anyone could help, that'd be great. I'm running Ubuntu 16.04 from ovh on mac terminal.