Update specs and added AccessError.

Dropbox.Api/AccessException.cs

@@ -0,0 +1,25 @@
+// <auto-generated>
+// Auto-generated by StoneAPI, do not modify.
+// </auto-generated>
+
+namespace Dropbox.Api
+{
+    using sys = System;
+
+    using Dropbox.Api.Auth;
+
+    /// <summary>
+    /// <para>An HTTP exception that is caused by the account notnot having access to the
+    /// endpoint.</para>
+    /// </summary>
+    public sealed partial class AccessException : StructuredException<AccessError>
+    {
+        /// <summary>
+        /// <para>Decode from given json.</para>
+        /// </summary>
+        internal static AccessException Decode(string json, sys.Func<AccessException> exceptionFunc)
+        {
+            return StructuredException<AccessError>.Decode<AccessException>(json, AccessError.Decoder, exceptionFunc);
+        }
+    }
+}