Invalid package manifest "package.xml"

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Hi! I found a some entries but none seem to help with my problem. I am currently following the instructions to install turtlebot on this site: http://wiki.ros.org/turtlebot/Tutoria... when running following command under point 2.2:

rosdep install --from-paths src -i -y

I get following stack trace:

nicolas@myworkstation:~/rocon$ rosdep install --from-paths src -i -y

ERROR: Rosdep experienced an error: Invalid package manifest "/opt/ros/indigo/share/catkin/package.xml": Error(s) in /opt/ros/indigo/share/catkin/package.xml:
- The manifest must not contain the following tags: depend, build_export_depend, buildtool_export_depend
Please go to the rosdep page [1] and file a bug report with the stack trace below.
[1] : http://www.ros.org/wiki/rosdep

rosdep version: 0.11.2

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 136, in rosdep_main
    exit_code = _rosdep_main(args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 345, in _rosdep_main
    return _package_args_handler(command, parser, options, args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 416, in _package_args_handler
    pkgs = find_catkin_packages_in(path, options.verbose)
  File "/usr/lib/python2.7/dist-packages/rosdep2/catkin_packages.py", line 33, in find_catkin_packages_in
    packages = find_packages(path)
  File "/usr/local/lib/python2.7/dist-packages/catkin_pkg/packages.py", line 87, in find_packages
    package = parse_package(os.path.join(basepath, path))
  File "/usr/local/lib/python2.7/dist-packages/catkin_pkg/package.py", line 315, in parse_package
    return parse_package_string(f.read(), filename)
  File "/usr/local/lib/python2.7/dist-packages/catkin_pkg/package.py", line 448, in parse_package_string
    raise InvalidPackage('Error(s) in %s:%s' % (filename, ''.join(['\n- %s' % e for e in errors])))
InvalidPackage: Invalid package manifest "/opt/ros/indigo/share/catkin/package.xml": Error(s) in /opt/ros/indigo/share/catkin/package.xml:
- The manifest must not contain the following tags: depend, build_export_depend, buildtool_export_depend

There must be a problem with my package.xml file.

It seems that the package version 2 might cause the error but I honestly don't know how to fix it. Does anyone have any ideas? Thanks in advance!