Troubleshooting "Intro to tf" tutorial

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Hello all,

I'm working through the tf tutorial at http://www.ros.org/wiki/tf/Tutorials/... , but when I get to Step #5, I get the following error:

/opt/ros/diamondback/stacks$ rosrun tf view_frames
Listening to /tf for 5.000000 seconds
Done Listening
Traceback (most recent call last):
  File "/opt/ros/diamondback/stacks/geometry/tf/scripts/view_frames", line 130, in <module>
    generate(dot_graph)
  File "/opt/ros/diamondback/stacks/geometry/tf/scripts/view_frames", line 85, in generate
    with open('frames.gv', 'w') as outfile:
IOError: [Errno 13] Permission denied: 'frames.gv'

Would someone be so kind as to tell me what this error means by "permission" (I have root priveleges but sudo rosrun tf view_frames just errored)? And how to go about obtaining that permission?

I'm working on a virtual machine with Ubuntu 10.05 and ROS Diamondback installed. My physical machine has Windows Vista, if that's important.

Thanks,

Khiya