Error trying to load PgProcedureExecutor on Mono 3.8

[JosephFerano]

When trying to load a simple Nancy server, I get this error.

System.TypeLoadException
Could not load type 'Simple.Data.PostgreSql.PgProcedureExecutor' from assembly 'Simple.Data.PostgreSql, Version=0.17.0.0, Culture=neutral, PublicKeyToken=null'.

Description: HTTP 500.Error processing request.
Details: Non-web exception. Exception origin (name of application or object): mscorlib.
Exception stack trace:
  at (wrapper managed-to-native) System.MonoType:GetPropertiesByName (System.MonoType,string,System.Reflection.BindingFlags,bool,System.Type)
  at System.MonoType.GetProperties (BindingFlags bindingAttr) [0x00000] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/corlib/System/MonoType.cs:318 
  at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo+<GetExportMembers>c__Iterator0.MoveNext () [0x00110] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/AttributedModel/AttributedPartCreationInfo.cs:358 
  at System.Linq.Enumerable.Any[MemberInfo] (IEnumerable`1 source) [0x00024] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.Core/System.Linq/Enumerable.cs:138 
  at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.HasExports () [0x00000] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/AttributedModel/AttributedPartCreationInfo.cs:113 
  at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.IsPartDiscoverable () [0x0001d] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/AttributedModel/AttributedPartCreationInfo.cs:94 
  at System.ComponentModel.Composition.AttributedModel.AttributedModelDiscovery.CreatePartDefinitionIfDiscoverable (System.Type type, ICompositionElement origin) [0x0000a] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/AttributedModel/AttributedModelDiscovery.cs:20 
  at System.ComponentModel.Composition.Hosting.TypeCatalog.get_PartsInternal () [0x00052] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/Hosting/TypeCatalog.cs:276 
  at System.ComponentModel.Composition.Hosting.TypeCatalog.CreateIndex () [0x0000b] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/Hosting/TypeCatalog.cs:328 
  at System.Lazy`1[System.Collections.Generic.IDictionary`2[System.String,System.Collections.Generic.List`1[System.ComponentModel.Composition.Primitives.ComposablePartDefinition]]].InitValue () [0x0015f] in /Volumes/build-root-ramdisk/mono-3.8.0/mcs/class/corlib/System/Lazy.cs:164 
Version Information: 3.8.0 ((no/db71bc1 Fri Sep 12 13:10:47 EDT 2014); ASP.NET Version: 4.0.30319.17020