this isn't working the servo just twitches

Dependencies:   Servo mbed Motor

Revision:
0:22157cad3c1e
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Oct 05 17:05:46 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/552587b429a1
\ No newline at end of file