Minecraft scoreboard eclipse?

I have programmed my first scoreboard and want to know what is wrong, because nothing is shown in the game. Thank you!

How about using a site like https://pastebin.com/ to make it easier to read?
See 1.

Obviously something is wrong with getPlugin, look that you can have the traceback output

Is there somewhere on which of the scripts it is?

What are you going to do with the scheduler? Set once and you're done. If you want to update it, you have to create a new method and you should work with teams, otherwise it will flicker, display errors, etc.

Something is wrong with the getPlugin (you can see it by the red lines), but I don't see where the error is. Path.
Do you already have a scorboard? Each player can only have one scorboard, this also includes the tablist or ranks (prefix).

I hope it can help you. I wish you success. And maybe look for a program with which you can take a screenshot, it would be more convenient and show the imports.