deserialiser error on update 2.0.8 -> 2.1.1

I am getting this after "clean" update (removing Assets/MapMagic) of 2.0.8 to 2.1.1:

Could not find type for: MapMagic.Nodes.Biomes.Function200+FnInlet`1[[Den.Tools.Matrices.MatrixWorld, Den.Tools, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]], MapMagic, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
UnityEngine.Debug:LogError (object)
Den.Tools.Serializer:DeserializeObject (int,Den.Tools.Serializer/Object[],object[],object[],System.Action`1) (at Assets/MapMagic/Tools/Serializer.cs:498)
Den.Tools.Serializer:DeserializeObject (int,Den.Tools.Serializer/Object[],object[],object[],System.Action`1) (at Assets/MapMagic/Tools/Serializer.cs:582)
Den.Tools.Serializer:DeserializeObject (int,Den.Tools.Serializer/Object[],object[],object[],System.Action`1) (at Assets/MapMagic/Tools/Serializer.cs:633)
Den.Tools.Serializer:Deserialize (Den.Tools.Serializer/Object[],System.Action`1) (at Assets/MapMagic/Tools/Serializer.cs:191)
MapMagic.Nodes.GraphSerializer200Beta:Deserialize (MapMagic.Nodes.Graph) (at Assets/MapMagic/Nodes/GraphSerializer.cs:58)
MapMagic.Nodes.Graph:OnAfterDeserialize () (at Assets/MapMagic/Nodes/Graph.cs:1150)

What this could be?