Enabling error

Hi, so i have an intresting error, which makes no sense for me.
So basically i have a server which is running on 1.8.8 (same as my local server) and my plugin throws me this error when i enable my plugin:


But. When i try it on my local server everything is okay. The server jar is the same.
This line causes the error:

Code:

Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {

 

did you update the commands in your plugin.yml file?

 

@bigflori What is your class visibility modifier? I don't think i've gotten that specific error before, so i'm not sure that's what's causing it, i'm just guessing.

 

Sorry, i dont know what do you mean or how can i check it

 

@bigflori Is your Main class public, private, protected, or doesn't it have a visibility modifier?

 

Can you show your full code?