generating documentation with doxygen: encoding problems

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When I try to generate the doxygen documentation of my C++ Code I get the error explained below. Does anybody know how to avoid this problem? Does this mean that my doxygen documentation on C++ files is bad-written? Thanks in advance

$ rosrun rosdoc rosdoc mypackage
/opt/ros/fuerte/stacks/documentation/rosdoc/src/rosdoc/rdcore.py:43: UserWarning: roslib.rospack is deprecated, please use rospkg
  import roslib.rospack
initializing rosdoc context:
    package filters: ['mypackage']
    path filters: []
+package[mypackage]
+stack[mystack]
ERROR: Doxygen of package [mypackage] failed: 'ascii' codec can't encode character u'\xf1' in position 7: ordinal not in range(128)
copying /opt/ros/fuerte/stacks/documentation/rosdoc/templates/styles.css to doc/styles.css
copying /opt/ros/fuerte/stacks/documentation/rosdoc/templates/msg-styles.css to doc/msg-styles.css
Timings
 * 0.00 epydoc
 * 0.00 support_files
 * 0.02 doxygen
 * 0.00 sphinx
 * 0.00 upload
 * 0.00 landing-page
 * 0.67 msg