catkin-pkg distribution was not found

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Hi ROS-Community,

I am using ubuntu 16.04 with ROS Kinetic build from source. Today I tried to recompile my workspace, but now I get some errors using catkin_find_pkg, which does not allow me to compile any package at all.

If I try to compile my workspace:

CMake Error at CMakeLists.txt:20 (message):
Search for 'catkin' in workspace failed (catkin_find_pkg catkin
/home/hkluessendorff/ros/2-additional/src): Traceback (most recent call
last):

File "/usr/local/bin/catkin_find_pkg", line 5, in <module>
  from pkg_resources import load_entry_point
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2927, in <module>
  @_call_aside
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
  f(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
  working_set = WorkingSet._build_master()
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 637, in _build_master
  return cls._build_from_requirements(__requires__)
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 650, in _build_from_requirements
  dists = ws.resolve(reqs, Environment())
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 829, in resolve
  raise DistributionNotFound(req, requirers)

pkg_resources.DistributionNotFound: The 'catkin-pkg==0.4.3' distribution
was not found and is required by the application

I get the same error when I just invoke catkin_find_pkg

Traceback (most recent call last):
File "/usr/local/bin/catkin_find_pkg", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2927, in <module>
@_call_aside
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 637, in _build_master
return cls._build_from_requirements(__requires__)
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 650, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 829, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'catkin-pkg==0.4.3' distribution was not found and is required by the application

I looked inside python-catkin-pkg which I installed via apt-get

python-catkin-pkg is already the newest version (0.4.6-100).

It seems to me that somehow I need catkin-pkg version 0.4.3, but installed 0.4.6 via an apt-get upgrade.

Anybody of you has an idea how to solve this error?

Thanks in advance for your advice

Best regards,