Slapper kick everyone

Hello Aternos!

I have a problem in my friend server.

When I add a slapper everyone kick of the server due the Internal server error. I checked log but I can not understand anything about it.

Can you help me?

This is server log

My own server has these problems but nothing happens.

I deleted all the plugins and install them again. But we have this problem again.

I have many problems like that in my friends servers. Like this: I run this command:

/mw rename world lobby

And this error again: Internal server error.

I hate this error!

I can only join 1 seconds in the server. In log, we have error when I join the game. (error is in line 279)

Hmm... I try to install the newest version, but don't close the thread please.