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Pogo's Bukkit Tutorial is probably a good starting point.
It might have to do with the fact that you're setting the location to null first, which would explain the NPE. You might want to check the...
Location also requires the world
Do they have the "plots.plot.#" permission, where "#" is the max amount of plots you want them to have?
If I am understanding you correctly, you'll want to use "forced hosts" in the bungeecord config.yml
If it's a bungeecord plugin, it should be posted in the bungeecord section
This sounds like another variant of cookie clicker.
Looks like you either don't have PlaceholderAPI installed or that it's not set up correctly.
Is your server on 1.12 but you are attempting to use the new 1.13 pressure plates? If so, it's most likely ViaVersion.
What version are you using? I couldn't get it to work.
It doesn't work on 1.13
DiscordSRV is mentioned 21 times in the crash report. Are you using an up-to-date version?