dbus-glib help/banshee-1. Help.

I am tring to write a Banshee 1.4.3 spammer in c on Linux Debian Lenny using C and dbus-glib.

But I can't figure out how to grab the track information right. x.x I get an error on compile, stating:
spammer.c:57: error: dereferencing pointer to incomplete type.

Code:

#include <stdio.h>
#include <dbus/dbus-glib.h>
#include <string.h>

void banshee_get(GHashTable *table, const char *key, char *dest)
 {
       GValue* value = (GValue*) g_hash_table_lookup(table, key);
       if (value != NULL && G_VALUE_HOLDS_STRING(value)) {
             strncpy(dest, g_value_get_string(value), strlen-1);
       }
 }



int main (int argc, char **argv)
{
  DBusGConnection *connection;
  GError *error;
  DBusGProxy *proxy;
  struct TrackInfo *tinfo;
  GHashTable* table;

  g_type_init ();

  error = NULL;
  connection = dbus_g_bus_get (DBUS_BUS_SESSION,
                               &error);
  if (connection == NULL)
  {
      g_printerr ("Failed to open connection to bus: %s\n",
                  error->message);
      g_error_free (error);
      exit (1);
  }

  /* Create a proxy object for the "bus driver" (name "org.bansheeproject.Banshee") */
  
  proxy = dbus_g_proxy_new_for_name (connection,
                                     "org.bansheeproject.Banshee",
                                     "/org/bansheeproject/Banshee/PlayerEngine",
                                     "org.bansheeproject.Banshee.PlayerEngine");

  /* Call GetCurrentTrack method, wait for reply */
  error = NULL;
	
  if (!dbus_g_proxy_call (proxy, "GetCurrentTrack", &error, G_TYPE_INVALID,
                           dbus_g_type_get_map("GHashTable", G_TYPE_STRING, G_TYPE_VALUE), &table,
                           G_TYPE_INVALID))
  {
      g_printerr ("Error: %s\n", error->message);
      g_error_free (error);
      exit (1);
  }

  /* Print the results */
  banshee_get(table, "album", tinfo->album);
  g_object_unref (proxy);

  return 0;
}

gcc `pkg-config --libs --cflags glib-2.0 dbus-glib-1` spammer.c