Minecraft economy pay plugin?

Moinsen, I didn't program an economy system, but the pay command doesn't work.

My code: https://hastebin.com/...ezeji.java

The error: https://hastebin.com/...lavozok.cs

If you want to get help, you should use working links or put the code in it.

For me, links work.

For me the page was empty, now the code is there.