[1.12.1] Trouble with Scoreboards and Getting All Players

Source: https://pastebin.com/xBuCEi0w
I've been trying to make scoreboard teams and a test "kills" objective in the 1.12.1 API, but I am running into internal errors (NullPointerException, I believe), and even when these exceptions are not thrown, it doesn't work as intended.

Also, I've commented out some code somewhere within onCommand that attempts to get all the players online; however, this is causing crashes. Preferably, I'd put it in an array or an ArrayList.

 

Could you show us the NPE error?

 

https://imgur.com/a/h4btb

I posted an imgur link, but it's gotta get approved first.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@NightTerror6
The issues is that you are always creating a new red team instead of trying to get the existing team. Use Scoreboard#getTeam instead of registering the teams over again.

 

But why get something that doesn't exist?

 

@NightTerror6
Because it does exists; That's why you are getting the error.

 

ok, thanks, I'll try it
NICE ITALICS

EDIT: Actually, registering the teams wasn't the problem, it was setting the team prefix. Also, whenever I register the teams, either way that is suggested, it still seems that there are no teams.

EDIT: nvm, screw this, I wrote my own Team class