diff --git a/src/common.hpp b/src/common.hpp
index 650f2de..f520828 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -22,5 +22,24 @@
 #include <boost/lexical_cast.hpp>
 #include <boost/algorithm/string.hpp>
 #include <boost/algorithm/string/regex_find_format.hpp>
+#include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/info_parser.hpp>
 
+#include "../build/src/config.hpp"
+
+namespace ndn {
+namespace nrd {
+
+class Error : public std::runtime_error
+{
+public:
+  explicit
+  Error(const std::string& what)
+    : std::runtime_error(what)
+  {
+  }
+};
+
+} //namespace nrd
+} //namespace ndn
 #endif // NRD_COMMON_HPP