differential_drive compilation error: request for member ‘__getMD5Sum’ in ‘m’, which is of non-class type ‘const int’

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Hi guys,

I'm trying to follow this tutorial:

http://www.ros.org/wiki/differential_drive

but when I compile it I get the following error:

/opt/ros/groovy/include/ros/message_traits.h: In static member function ‘static const char* ros::message_traits::MD5Sum<M>::value(const M&) [with M = int]’:
  /opt/ros/groovy/include/ros/message_traits.h:255:104:   instantiated from ‘const char* ros::message_traits::md5sum(const M&) [with M = int]’
  /opt/ros/groovy/include/ros/publisher.h:112:7:   instantiated from ‘void ros::Publisher::publish(const M&) const [with M = int]’
  /home/d4n/sdc2130/src/auto.cpp:204:29:   instantiated from here
  /opt/ros/groovy/include/ros/message_traits.h:126:34: error: request for member ‘__getMD5Sum’ in ‘m’, which is of non-class type ‘const int’
  /opt/ros/groovy/include/ros/message_traits.h: In static member function ‘static const char* ros::message_traits::DataType<M>::value(const M&) [with M = int]’:
  /opt/ros/groovy/include/ros/message_traits.h:264:106:   instantiated from ‘const char* ros::message_traits::datatype(const M&) [with M = int]’
  /opt/ros/groovy/include/ros/publisher.h:112:7:   instantiated from ‘void ros::Publisher::publish(const M&) const [with M = int]’
  /home/d4n/sdc2130/src/auto.cpp:204:29:   instantiated from here
  /opt/ros/groovy/include/ros/message_traits.h:143:36: error: request for member ‘__getDataType’ in ‘m’, which is of non-class type ‘const int’
  /opt/ros/groovy/include/ros/message_traits.h: In static member function ‘static const char* ros::message_traits::MD5Sum<M>::value(const M&) [with M = int]’:
  /opt/ros/groovy/include/ros/message_traits.h:127:3: warning: control reaches end of non-void function [-Wreturn-type]
  /opt/ros/groovy/include/ros/message_traits.h: In static member function ‘static const char* ros::message_traits::DataType<M>::value(const M&) [with M = int]’:
  /opt/ros/groovy/include/ros/message_traits.h:144:3: warning: control reaches end of non-void function [-Wreturn-type]
  make[2]: *** [CMakeFiles/sdc2130.dir/src/auto.cpp.o] Error 1
  make[1]: *** [CMakeFiles/sdc2130.dir/all] Error 2

the line that give me the error is:

rwheel_pub.publish(absenc2);

someone tell that could be an error from the different format type of the variable, could someone help me a little more?

thanks guys