Does anyone know what the heck this error is?

[hayate1000]

Hello guys,

everytime i want to trade that club or put it on the ground i get this error.
and its only that club, all other stuff works fine.
i dont know what that is so please help me out if u know whats going on with this "SE: 11302" ("SE: 11300": if i wanna trade that club) so two different errors.

[Jalan_Jalan]

This is the message that usually says that you can't trade or drop the club because it is your highest potency item of that type.
Get the latest patches and install them to fix it.
Or download a new client and let it autopatch, from seeing the font your client uses it must be rather old.

[Super.Pvper]

Yes, exactly what Jalan_Jalan said;

I would recommend just downloading the newest client, its the best way.