If you are developing with MAFW, have the framework compiled and try to run your program inside Scratchbox, do not forget to set correctly the environment with sb-fremantle-init.sh start and run MAFW daemons with run-standalone.sh as:

sb-fremantle-init.sh start
run-standalone.sh mafw-playlist-daemon -d
run-standalone.sh mafw-dbus-wrapper PLUGIN &