diff --git a/include/fc/error_report.hpp b/include/fc/error_report.hpp
index 2efdb2e..7b088d7 100644
--- a/include/fc/error_report.hpp
+++ b/include/fc/error_report.hpp
@@ -13,7 +13,7 @@ namespace fc {
    class error_frame {
       public:
          error_frame( const fc::string& file, uint64_t line, const fc::string& method, const fc::string& desc, fc::value m );
-         error_frame(){}
+         error_frame():file("unknown-file"),line(0){}
          error_frame(const error_frame& );
          error_frame(error_frame&& );
 
@@ -55,6 +55,7 @@ namespace fc {
    };
 
    fc::string substitute( const fc::string& format, const fc::value& keys );
+   fc::value  recursive_substitute( const value& in, const fc::value& keys );
 
 } // namespace fc
 
diff --git a/include/fc/value.hpp b/include/fc/value.hpp
index 3061778..5403c0f 100644
--- a/include/fc/value.hpp
+++ b/include/fc/value.hpp
@@ -189,10 +189,8 @@ namespace fc {
        ~key_val(){ }
        
        key_val& operator=( key_val&& k ) {
-         slog( "swap key");
          fc_swap( key, k.key );
-         slog( "swap val");
-	 fc_swap( val, k.val );
+	       fc_swap( val, k.val );
          return *this;
        }
 
diff --git a/include/fc/value_cast.hpp b/include/fc/value_cast.hpp
index ce7afa5..6c4968c 100644
--- a/include/fc/value_cast.hpp
+++ b/include/fc/value_cast.hpp
@@ -181,8 +181,7 @@ namespace fc {
             int idx = 0;
             for( auto i = a.fields.begin(); i != a.fields.end(); ++i ) {
               try {
-                m_out.push_back(T());
-                unpack( *i, m_out.back()  );
+                m_out.push_back( value_cast<T>( *i ) );
               } catch( fc::error_report& er ) {
                  throw FC_REPORT_PUSH( er, "Error parsing array index ${index} to ${type}", 
                                            fc::value().set("index", idx).set("type",fc::get_typename<T>::name()) );
@@ -234,9 +233,7 @@ namespace fc {
              template<typename Member>
              void operator()( Member& m ) {
                try {
-                  //m = value_cast<Member>(_val[idx]);
-                  unpack( _val[idx], m );
-                //  m = value_cast<Member>(_val[idx]);
+                  m = value_cast<Member>(_val[idx]);
                } catch ( fc::error_report& er ) {
                   throw FC_REPORT_PUSH( er, "Error parsing tuple element ${index}", fc::value().set("index",idx) );
                }
@@ -332,9 +329,6 @@ namespace fc {
     }
     template<typename T>
     T value::cast()const {
-         T tmp;
-         unpack(*this,tmp);
-         return tmp;
-//        return unpackvalue_cast<T>(*this);
+        return value_cast<T>(*this);
     }
 }
diff --git a/src/error_report.cpp b/src/error_report.cpp
index ec4c588..c66e6d3 100644
--- a/src/error_report.cpp
+++ b/src/error_report.cpp
@@ -135,6 +135,28 @@ fc::string substitute( const fc::string& format, const fc::value& keys ) {
     return ss.str();
 }
 
+/**
+ *   Performs variable substitution on all strings in keys or values of 'in' with 
+ *   values from keys.
+ */
+fc::value recursive_substitute( const value& in, const fc::value& keys ) {
+  fc::value out;
+  if( in.is_string() ) {
+      return fc::substitute( in.cast<string>(), keys );
+  }
+  else if( in.is_object() ) {
+    for( auto itr = in.begin(); itr != in.end(); ++itr ) {
+      out[fc::substitute(itr->key, keys)] = recursive_substitute( itr->val, keys );
+    }
+    return out;
+  }
+  else if( in.is_array() ) {
+    for( size_t i = 0; i < in.size(); ++i ) {
+       out.push_back( recursive_substitute( in[i], keys ) );
+    }
+  }
+  return in;
+}
 
 fc::string error_report::to_string()const {
   fc::stringstream ss;
diff --git a/src/filesystem.cpp b/src/filesystem.cpp
index 3cd8e98..48fa7b5 100644
--- a/src/filesystem.cpp
+++ b/src/filesystem.cpp
@@ -138,7 +138,7 @@ namespace fc {
   void remove_all( const path& p ) { boost::filesystem::remove_all(p); }
   void copy( const path& f, const path& t ) { 
      try {
-  	boost::filesystem::copy( boost::filesystem::path(f), boost::filesystem::path(t) ); 
+  	    boost::filesystem::copy( boost::filesystem::path(f), boost::filesystem::path(t) ); 
      } catch ( boost::system::system_error& e ) {
      	FC_THROW_REPORT( "Copy from ${srcfile} to ${dstfile} failed because ${reason}",
 	         fc::value().set("srcfile",f).set("dstfile",t).set("reason",e.what() ) );
@@ -147,9 +147,29 @@ namespace fc {
 	         fc::value().set("srcfile",f).set("dstfile",t).set("inner", fc::except_str() ) );
      }
   }
-  void create_hard_link( const path& f, const path& t ) { boost::filesystem::create_hard_link( f, t ); }
-  bool remove( const path& f ) { return boost::filesystem::remove( f ); }
-  fc::path canonical( const fc::path& p ) { return boost::filesystem::canonical(p); }
+  void create_hard_link( const path& f, const path& t ) { 
+     try {
+        boost::filesystem::create_hard_link( f, t ); 
+     } catch ( ... ) {
+         FC_THROW_REPORT( "Unable to create hard link from '${from}' to '${to}'", 
+                          fc::value().set( "from", f )
+                          .set("to",t).set("exception", fc::except_str() ) );
+     }
+  }
+  bool remove( const path& f ) { 
+     try {
+        boost::filesystem::remove( f ); 
+     } catch ( ... ) {
+         FC_THROW_REPORT( "Unable to remove '${path}'", fc::value().set( "path", f ).set("exception", fc::except_str() ) );
+     }
+  }
+  fc::path canonical( const fc::path& p ) { 
+     try {
+        return boost::filesystem::canonical(p); 
+     } catch ( ... ) {
+         FC_THROW_REPORT( "Unable to resolve path '${path}'", fc::value().set( "path", p ).set("exception", fc::except_str() ) );
+     }
+  }
   fc::path absolute( const fc::path& p ) { return boost::filesystem::absolute(p); }
   path     unique_path() { return boost::filesystem::unique_path(); }
   path     temp_directory_path() { return boost::filesystem::temp_directory_path(); }
diff --git a/src/json_rpc_stream_connection.cpp b/src/json_rpc_stream_connection.cpp
index 285c787..1aa7a59 100644
--- a/src/json_rpc_stream_connection.cpp
+++ b/src/json_rpc_stream_connection.cpp
@@ -39,6 +39,7 @@ namespace fc { namespace json {
            while( !in.eof() ) {
 	    // std::cerr<<"\n**line size: "<<line.size()<<"\n\n";
             //   slog( "line size: '%d'", line.size() );
+            //   slog( "%s", line.c_str() );
                try {
                  fc::value v= fc::json::from_string( line );
                  self.handle_message(v);
diff --git a/vendor/libssh2-1.4.2/libssh2_debug.a b/vendor/libssh2-1.4.2/libssh2_debug.a
deleted file mode 100644
index f08659b..0000000
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diff --git a/vendor/sigar/libsigar_debug.a b/vendor/sigar/libsigar_debug.a
deleted file mode 100644
index 0195ac3..0000000
Binary files a/vendor/sigar/libsigar_debug.a and /dev/null differ