Server problems

Hi!

I have created a 1.1.4 server, and i have a little problems.

1º The console said me that: https://mclo.gs/MTp8v9m

I have installed the Spigot plugin, but i tried too with PaperMC.

2º When i tried to login o minecraft a problem occurs, i copy the message as is : "Internal exception: io.netty.handler.codec.DecoderException: java.io.IOException: Bad packet id 26.

I would like to see answers. Thanks anyways.

Okay, then i can't login because 1.14 is not enough optimized?

Thank you Joshua, and one more question.

Is the internal exception fail a problem with aternos 1.14? I never seen that before on my minecraft.