Plugin Error at startup | Minecraft?

When I start my survival system, this error always comes here:

So I can't do anything with it, except that probably a part of the code was written with an older Java version. If that's the case

I actually did it the way I always program it. However, I programmed a part of the code from Eclipse, which I had to reinstall because of a newer Java version.

Is that because of it? And do I have to rewrite jz my inserted code?

You would have to be able to convert the Java version in eclipse… Just just not know where anymore

The Java version is outdated and you need to update it

I downloaded Java 2 days ago. It can't be due to that

Okay thanks. I'll take a look