std_msgs / MultiArrayDimention

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hi, i try to convert sonor range to 2D data and i follow this tutorial to do it link text) i found this error:

/home/pi/catkin_ws/src/robot_setup_tf/src/sonarInjector.cpp:5:42: fatal error: std_msgs/MultiArrayDimention.h: No such file or directory
 #include "std_msgs/MultiArrayDimention.h"
                                          ^
compilation terminated.
robot_setup_tf/CMakeFiles/sonarInjector.dir/build.make:54: recipe for target 'robot_setup_tf/CMakeFiles/sonarInjector.dir/src/sonarInjector.cpp.o' failed
make[2]: *** [robot_setup_tf/CMakeFiles/sonarInjector.dir/src/sonarInjector.cpp.o] Error 1
CMakeFiles/Makefile2:2893: recipe for target 'robot_setup_tf/CMakeFiles/sonarInjector.dir/all' failed
make[1]: *** [robot_setup_tf/CMakeFiles/sonarInjector.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2
Invoking "make -j1 -l1" failed

Can you help me please to find the solution? thanks