Hello,
I run pixelmon 4.2.7 for Minecraft 1.8.9 and am getting a Pokeball manager error on a few different things. A couple of the commands I have noticed that throw up that error are when a gymleader tries accepting a challenge (Using the Feebas gym mod), and when trying to set a pokemon as a Mystery Gift. This happens every time and it does not allow the command to go through. The following is a screenshot of the console error that the gym one throws
https://gyazo.com/def5a5a4eec786a9b7cfb513b4241180And this pastebin lists the mods and plugins used on my server:
http://pastebin.com/7Cc8gLxP