Does installing plugins (WorldEdit and WorldGuard) changed recently? I dropped them in /plugins folder, load the server and this errors poped out:
https://pastebin.com/sey8VTk3I

I went to Bukkit forum to seek help, they told me I need Java 21 but... FOR THE SERVER NOT CLIENT!

There is a way to solve this problem?

Please don't necropost 

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Hi! I'm trying to detect when the player lands, (like the title suggests).

If it helps, I'm pushing the player in the air, and then pushing them back down to make an explosion when they land.

on offhand switch:
  if {Bakugo} contains player:
    cancel event
    if {BakugoMoveset} contains 2:
      if {BakugoExplode2} is true:
        send action bar "<##FF5700>&lBlast Down on cooldown!" to player
      else:
        set {BakugoExplode2} to true
        push player up with speed 0.5
        wait 0.3 second
        push player up with speed -1
        # (Right here is where I wanna wait for the player to land and detect when they do so)
        create an explosion of force 4 at {Bakugo}
        push player up with speed 1
        wait 6 seconds
        send action bar "<##FF5700>&lBlast Down Ready!" to player
        set {BakugoExplode2} to false

Anything helps! Thanks!