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diff --git a/include/jsoncons_ext/ubjson/ubjson_error.hpp b/include/jsoncons_ext/ubjson/ubjson_error.hpp
new file mode 100644
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+++ b/include/jsoncons_ext/ubjson/ubjson_error.hpp
@@ -0,0 +1,100 @@
+/// Copyright 2018 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_UBJSON_UBJSON_ERROR_HPP
+#define JSONCONS_UBJSON_UBJSON_ERROR_HPP
+
+#include <system_error>
+#include <jsoncons/config/jsoncons_config.hpp>
+
+namespace jsoncons { namespace ubjson {
+
+enum class ubjson_errc
+{
+    success = 0,
+    unexpected_eof = 1,
+    source_error,
+    count_required_after_type,
+    length_is_negative,
+    length_must_be_integer,
+    unknown_type,
+    invalid_utf8_text_string,
+    too_many_items,
+    too_few_items,
+    number_too_large,
+    max_nesting_depth_exceeded,
+    key_expected,
+    max_items_exceeded
+};
+
+class ubjson_error_category_impl
+   : public std::error_category
+{
+public:
+    const char* name() const noexcept override
+    {
+        return "jsoncons/ubjson";
+    }
+    std::string message(int ev) const override
+    {
+        switch (static_cast<ubjson_errc>(ev))
+        {
+            case ubjson_errc::unexpected_eof:
+                return "Unexpected end of file";
+            case ubjson_errc::source_error:
+                return "Source error";
+            case ubjson_errc::count_required_after_type:
+                return "Type is specified for container, but count is not specified";
+            case ubjson_errc::length_is_negative:
+                return "Request for the length of an array, map or string returned a negative result";
+            case ubjson_errc::length_must_be_integer:
+                return "Length must be a integer numeric type (int8, uint8, int16, int32, int64)";
+            case ubjson_errc::unknown_type:
+                return "Unknown type";
+            case ubjson_errc::invalid_utf8_text_string:
+                return "Illegal UTF-8 encoding in text string";
+            case ubjson_errc::too_many_items:
+                return "Too many items were added to a UBJSON object or array of known length";
+            case ubjson_errc::too_few_items:
+                return "Too few items were added to a UBJSON object or array of known length";
+            case ubjson_errc::number_too_large:
+                return "Number exceeds implementation limits";
+            case ubjson_errc::max_nesting_depth_exceeded:
+                return "Data item nesting exceeds limit in options";
+            case ubjson_errc::key_expected:
+                return "Text string key in a map expected";
+            case ubjson_errc::max_items_exceeded:
+                return "Number of items in UBJSON object or array exceeds limit set in options";
+            default:
+                return "Unknown UBJSON parser error";
+        }
+    }
+};
+
+inline
+const std::error_category& ubjson_error_category()
+{
+  static ubjson_error_category_impl instance;
+  return instance;
+}
+
+inline 
+std::error_code make_error_code(ubjson_errc e)
+{
+    return std::error_code(static_cast<int>(e),ubjson_error_category());
+}
+
+
+}}
+
+namespace std {
+    template<>
+    struct is_error_code_enum<jsoncons::ubjson::ubjson_errc> : public true_type
+    {
+    };
+}
+
+#endif