The mod is interfering with your server's functionality, causing crashes.
The mod is interfering with your server's functionality, causing crashes.
It seems the issue might be with how the server loads the game. Try using a standard server to check if the problem persists.
It seems there might be an issue with your code, and I’m sorry to inform you—it’s time to debug.
The error indicates you're attempting to load a non-existent class named EntityPlayerSP. This class is required by mod.mcreator.mcreator_leatherCore on line 65, meaning your development files don't match what the server expects. It suggests you're working with different source materials than those used during server deployment.
These singleplayer mods for normal Minecraft won't function on the server. You'll have to adapt them for the server version.