diff --git a/src/Holon/Holon.csproj b/src/Holon/Holon.csproj
index 8deceaa..e1324f2 100644
--- a/src/Holon/Holon.csproj
+++ b/src/Holon/Holon.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard1.6</TargetFramework>
-    <Version>0.2.1</Version>
+    <Version>0.2.2</Version>
     <Authors>Alan Doherty</Authors>
     <Company>Alan Doherty</Company>
     <Description>A minimal service and event bus with additional support for RPC</Description>
@@ -10,11 +10,11 @@
     <PackageProjectUrl>https://github.com/alandoherty/holon-net</PackageProjectUrl>
     <RepositoryUrl>https://github.com/alandoherty/holon-net</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
-    <AssemblyVersion>0.2.1.0</AssemblyVersion>
+    <AssemblyVersion>0.2.2.0</AssemblyVersion>
     <PackageLicenseUrl>https://github.com/alandoherty/holon-net/blob/master/LICENSE</PackageLicenseUrl>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageIconUrl>https://s3-eu-west-1.amazonaws.com/assets.alandoherty.co.uk/github/holon-net-nuget.png</PackageIconUrl>
-    <FileVersion>0.2.1.0</FileVersion>
+    <FileVersion>0.2.2.0</FileVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/src/Holon/Remoting/RpcBehaviour.cs b/src/Holon/Remoting/RpcBehaviour.cs
index 0f11f3c..353021f 100644
--- a/src/Holon/Remoting/RpcBehaviour.cs
+++ b/src/Holon/Remoting/RpcBehaviour.cs
@@ -416,7 +416,7 @@ public Task<InterfaceInformation> GetInterfaceInfo(string @interface) {
 
                 lock (_behaviour._behaviours) {
                     if (!_behaviour._behaviours.TryGetValue(@interface, out binding) || !binding.AllowIntrospection)
-                        throw new RpcException("InterfaceNotFound", "The interface does not exist", null);
+                        throw new RpcException("InterfaceNotFound", "The interface does not exist", (string)null);
                 }
 
                 return Task.FromResult(binding.Introspection);
diff --git a/src/Holon/Remoting/RpcException.cs b/src/Holon/Remoting/RpcException.cs
index 1c8ff08..d317fab 100644
--- a/src/Holon/Remoting/RpcException.cs
+++ b/src/Holon/Remoting/RpcException.cs
@@ -29,7 +29,7 @@ public string Code {
         /// </summary>
         public string Details {
             get {
-                return _details;
+                return _details ?? ToString();
             }
         }
         #endregion
@@ -41,12 +41,35 @@ public string Details {
         /// <param name="code">The code.</param>
         /// <param name="message">The message.</param>
         /// <param name="details">The details.</param>
-        public RpcException(string code, string message, string details)
+        internal RpcException(string code, string message, string details)
             : base(message) {
             _code = code;
             _details = details;
         }
 
+        /// <summary>
+        /// Creates a new RPC excpetion with the provided code and message.
+        /// </summary>
+        /// <param name="code">The code.</param>
+        /// <param name="message">The message.</param>
+        public RpcException(string code, string message)
+            : base(message)
+        {
+            _code = code;
+        }
+
+        /// <summary>
+        /// Creates a new RPC excpetion with the provided code and message.
+        /// </summary>
+        /// <param name="code">The code.</param>
+        /// <param name="message">The message.</param>
+        /// <param name="innerException">The inner exception.</param>
+        public RpcException(string code, string message,  Exception innerException)
+            : base(message, innerException)
+        {
+            _code = code;
+        }
+
         /// <summary>
         /// Creates a new RPC exception with the RPC error object.
         /// </summary>