Error with the newest Unturned Update (3.13.2.1)

[Ayria]

[10/9/2015 10:05:26 PM] [Error] Failed to load CustomMOTD, unloading now... :System.TypeLoadException: Could not load type 'SDG.Unturned.Steam' from assembly 'CustomMOTD'.
at Rocket.Core.Plugins.RocketPlugin.LoadPlugin () [0x00000] in :0
[10/9/2015 10:05:26 PM] [Info] Unloading plugin: CustomMOTD