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Did you forget the '$' in the variable ROS_PACKAGE_PATH? It looks like your Bash startup script has something like this:

export PATH=ROS_PACKAGE_PATH/dev/rosbook:$PATH

You probably need the '$' before ROS_PACKAGE_PATH.

But... I don't know that book, but if the examples are designed to run using rosrun or roslaunch, then you don't need to add the rosbook stuff to the path, as rosrun and roslaunch will search your packages. Did you install the example code according to their directions? (You can't just pick any directory when using ROS with the catkin built tool.)