The versions of the plugins are: Mythicmobs: 5.4.0 - Modelengine: 3.1.8 and MCPets: 4.0.3

[vivid steeple]

Every time I get on a saddle I get the following error

but he still lets me go up.

[alpine juniper]

Did you use meg 4 at all?

or just meg 3

[vivid steeple]

I used meg4 once but now I'm on 3.1.8

[alpine juniper]

You need to remove all files

and keep Pets folders

if you ever used Meg 4 and switched back to meg 3

it will corrupt MCPets and MythicMobs

[vivid steeple]

I'll try

[lilac elbow]

Looks more like MM is not up to date or spigot, what version are you on to?

[vivid steeple]

1.19.4

[lilac elbow]

paper spigot?

[vivid steeple]

spigot

[lilac elbow]

can you try paper?

Probably it's missing a method here as it says

[vivid steeple]

Wouldn't changing from spigot to paper damage my entire server?

[vivid steeple]

I tried it on another server and apparently changing to paper worked

[alpine juniper]

no

it will actually improve it

by a huge lot

but make sure you get the last version of paper-spigot for 1.19.4