Here are some of the common problems that may arise when installing or using MORSE, and their solutions:

During installation

  • Problem: Python executables not found when configuring using cmake:

    morse/build $ cmake ..
    -- Could NOT find PythonInterp (missing:  PYTHON_EXECUTABLE)
    CMake Error at CMakeLists.txt:24 (MESSAGE):
    Can't find python 3.3 on your system
    -- Configuring incomplete, errors occurred!

    Solution: Indicate to cmake the location of the Python executable installed in your system. MORSE should try to find the location of the include files and libraries automatically:

    $ cmake -DPYTHON_EXECUTABLE=/usr/local/bin/python3.3 ..

When running morse

  • Problem: Blender executable not found:

    * The $MORSE_BLENDER environment variable doesn't point to a Blender executable! You should fix that! Trying to look for Blender in alternative places...
    which: no blender in (/usr/lib/mpich2/bin:/usr/lib/ccache:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin)
    * Could not find a correct Blender executable, neither in the path or in
    MORSE prefix. Blender >= 2.65 is required to run MORSE.  You can
    alternatively set the $MORSE_BLENDER environment variable to point to a
    specific Blender executable
    * Your environment is not yet correctly setup to run MORSE!
    Please fix it with above information.
    You can also run 'morse check' for more details.

    Solution: Configure the environment variable MORSE_BLENDER on your system. Locate the directory where you have installed Blender, and substitute that for {path_to_blender_executable} in the lines below. Depending on your shell (csh or bash) use one of these commands from your home directory.

    • csh:

      $ echo 'setenv MORSE_BLENDER {path_to_blender_executable}/blender' >> ~/.cshrc
    • bash:

      $ echo 'export MORSE_BLENDER={path_to_blender_executable}/blender' >> ~/.bashrc
  • Problem: MORSE libraries not found:

    * We could not find the MORSE Python libraries in your system. If MORSE was
    installed to some strange location, you may want to add it to your
    PYTHONPATH. Check INSTALL for more details.
    * Your environment is not yet correctly setup to run MORSE!
    Please fix it with above information.

    Solution: Configure the environment variable PYTHONPATH to point to the directory where you have installed the MORSE libraries in your system, as well as the site-packages sub-directory. By default MORSE will be installed in /usr/local, otherwise you must use the directory you indicated to cmake. Depending on your shell (csh or bash) use one of these commands from your home directory.

    • csh:

      $ echo 'setenv PYTHONPATH $PYTHONPATH\:/usr/local/lib/python3.3\:/usr/local/lib/python3.3/site-packages' >> ~/.cshrc
    • bash:

      $ echo 'export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python3.3:/usr/local/lib/python3.3/site-packages' >> ~/.bashrc


    The name of the installation directory may be different depending on your Linux distribution. If you use Ubuntu or similar distributions, replace the directory name of python3.3/site-packages for python3/dist-packages. Make sure to indicate the correct path used in your computer for all Python 3 libraries.

  • urandom error : make sure your python3 version is equal to the one in Blender.

  • ros No module named 'roslib' : source /opt/ros/***/setup.bash.

  • No module named 'error' : Yaml for Python2 is running instead of Python 3, install python3-yaml and/or fix your PYTHONPATH.

Developer specific

  • Problem: No rule to make target ‘test’

    • When trying to run make test, you get this error and make stops:

      morse/build $ make test
      make: *** No rule to make target 'test'. Stop.
    • This is because the pymorse bindings have not been installed

    Solution: Reconfigure MORSE with the PYMORSE_SUPPORT option, either by selecting the option using ccmake or by running:

    $ cd [your morse source directory]/build
    $ cmake -DPYMORSE_SUPPORT=ON [other options] ..

    You then need to run:

    $ make install
    $ make rebuild_cache

    And finally:

    $ make test
  • Problem: pymorse not found. When running make rebuild_cache, there is an error indicating:

    morse/build $ make rebuild_cache
    Running CMake to regenerate build system...
    \-\- will install python files in [your installation directory]
    CMake Warning at CMakeLists.txt:116 (MESSAGE):
          Can't run test, pymorse is required but cannot be found.
          You may want to install it first.

    Solution: The PYTHONPATH variable is not correctly setup. The location where was installed must be included in PYTHONPATH. The directory is indicated in the error message

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