So I just downloaded this, and I got this error message, it keeps spamming it, look at this image url to see: https://cdn.discordapp.com/attachments/1091181360653287555/1097218812828471336/2023-04-16_12.50.05.png and on top of that, it doesnt work.

You are using an outdated version. Try https://ci.dmulloy2.net/job/ProtocolLib/lastSuccessfulBuild/ for 1.19 support