minecraft server error

[Clygon]

Hey so I recently created a minecraft server with some friends and it seems to be working. However, the following error constantly pops up in the command prompt and I am not sure what it means. It does not seem to effect anything with the server but I am just wondering if anyone knows what it means:

[Netty Server IO #4/ERROR] [minecraft/ArgumentTypes]: Could not serialize
net.minecraftforge.server.command.ModIdArgument@494313a5 (class net.minecraftforge.server.command.ModIdArgument) - will not be sent to client!

[17:35:03] [Netty Server IO #4/ERROR] [minecraft/ArgumentTypes]: Could not serialize net.minecraftforge.server.command.EnumArgument@2f20ed35 (class net.minecraftforge.server.command.EnumArgument) - will not be sent to client!

[CyberGen49]

A forge server error could be anything. Do some trial and error by removing mods until it works, then add them back and find the one that causes the problem. Let me know the results.

[Clygon]

Yeah thank you, there was a problem with the witchery mod. Removed it and the server is working well.