Two things:
1. There's a big red text above the review section telling you, "If you have a problem or a question about the Plugin, message me first before leaving a review!"
2. After your review, I looked at the whole thing, the error doesn't occur.
Probably you just downloaded the wrong version. As described above, version 3.x is for 1.13 servers and version 2.x is for 1.12-1.7 servers.
The list of all versions can be found here:
https://www.spigotmc.org/resources/30201/history
If there is still a problem, please feel free to send me a private message.