System.MissingMethodException: Method not found: void Mafi.Base.LooseProductAttribute..ctor(string,string,bool,string,bool,bool,bool,int,bool,bool,bool,string,string,double)
at (wrapper managed-to-native) System.MonoCustomAttrs.GetCustomAttributesDataInternal(System.Reflection.ICustomAttributeProvider)
at System.MonoCustomAttrs.GetCustomAttributesDataBase (System.Reflection.ICustomAttributeProvider obj, System.Type attributeType, System.Boolean inheritedOnly) [0x00010] in <41d29b352f6a475ab1bf7c6628b82790>:0
at System.MonoCustomAttrs.GetCustomAttributesData (System.Reflection.ICustomAttributeProvider obj, System.Boolean inherit) [0x00011] in <41d29b352f6a475ab1bf7c6628b82790>:0
at System.Reflection.CustomAttributeData.GetCustomAttributes (System.Reflection.MemberInfo target) [0x00000] in <41d29b352f6a475ab1bf7c6628b82790>:0
at System.Reflection.RuntimeFieldInfo.GetCustomAttributesData () [0x00000] in <41d29b352f6a475ab1bf7c6628b82790>:0
at System.Reflection.MemberInfo.get_CustomAttributes () [0x00000] in <41d29b352f6a475ab1bf7c6628b82790>:0
at Mafi.Core.Mods.ProtoRegistrator+<>c.<RegisterAllProducts>b__48_4 (System.Reflection.FieldInfo f) [0x00000] in <d3d1130bbdd841a8824adc4442a66a18>:0
at System.Linq.Enumerable+WhereEnumerableIterator1[TSource].MoveNext () [0x00037] in <80564d689e48448fa2a7101993ee7201>:0 at Mafi.Collections.Lyst1[T].AddRange (System.Collections.Generic.IEnumerable1[T] items) [0x00044] in <c80141f84deb4fb5978cae9522ca8b36>:0 at Mafi.Collections.Lyst1[T]..ctor (System.Collections.Generic.IEnumerable1[T] elements) [0x00016] in <c80141f84deb4fb5978cae9522ca8b36>:0 at Mafi.LinqExtensions.ToLyst[T] (System.Collections.Generic.IEnumerable1[T] enumerable) [0x00000] in <c80141f84deb4fb5978cae9522ca8b36>:0
at Mafi.Core.Mods.ProtoRegistrator.RegisterAllProducts (System.Reflection.Assembly assembly) [0x000b5] in <d3d1130bbdd841a8824adc4442a66a18>:0
at CoI.MetallurgyPlus.MetallurgyPlusMod.RegisterPrototypes (Mafi.Core.Mods.ProtoRegistrator registrator) [0x0000a] in F:\cygwin\michi\CoI\Coi.Metallurgy+\Source\MetallurgyPlusMod.cs:33
at Mafi.Core.Game.GameBuilder.RegisterModsPrototypes (Mafi.Collections.ImmutableCollections.ImmutableArray1[T] mods, Mafi.Collections.ImmutableCollections.ImmutableArray1[T] modsData, Mafi.Core.Mods.ProtoRegistrator protoRegistrator, System.Boolean throwOnError) [0x00037] in <d3d1130bbdd841a8824adc4442a66a18>:0

Yes, I know. Update will come soon.

Update uploaded.