PCL Tutorial voxel_grid Permission Denied

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Hello,

I am new to ROS, Ubuntu, and PCL. I have Ubuntu 11.10. I am attempting to complete the ROS PCL Tutorials at http://www.ros.org/wiki/pcl/Tutorials. I got stuck at step 4.1.

I was unable to get the ./voxel_grid command to work in the linked part of the tutorial at the PCL website at http://www.pointclouds.org/documentation/tutorials/voxel_grid.php. I receive the following errors:

albertchi@albertchi-e6510:~/my_pcl_tutorial$ ./voxel_grid
bash: ./voxel_grid: No such file or directory
albertchi@albertchi-e6510:~/my_pcl_tutorial$ ./voxel_grid.cpp
bash: ./voxel_grid.cpp: Permission denied

I tried: albertchi@albertchi-e6510:~$ chmod 777 my_pcl_tutorial, but this did not change the output.

I moved on to the next step in the tutorial (the second part of step 4.1), and tried:

albertchi@albertchi-e6510:~$ rosmake my_pcl_tutorial
[ rosmake ] rosmake starting...                                                 
[ rosmake ] Packages requested are: ['my_pcl_tutorial']                         
[ rosmake ] Logging to directory /home/albertchi/.ros/rosmake/rosmake_output-20121022-112526
[ rosmake ] Expanded args ['my_pcl_tutorial'] to:
[]                            
[ rosmake ] WARNING: The following args could not be parsed as stacks or packages: ['my_pcl_tutorial']
[ rosmake ] ERROR: No arguments could be parsed into valid package or stack names.

Obviously, this was unsuccessful as well. Suggestions would be appreciated. I am hoping it is something simple because I am new.

Amanda