Build doc using sphinx ROS Melodic

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Hello,

I am trying to build documentation using sphinx and rosdoc_lite. For this I created docstring comments on my functions e.g.:

def goal_callback(self, msg):
    """Transforms the goal position from the map coordinate frame to the
    robot coordinate frame and publishes it to /move_base_simple/goal
    :param msg: The current goal in map / robot tf frame
    :return: None
    """

Afterwards followed the tutorial: http://wiki.ros.org/Sphinx

But I only get an empty html page. Meaning that no functions or classes are included in the website.

My folder structure looks like this:

    .
    ├── cfg
    ├── CMakeLists.txt
    ├── doc
    ├── launch
    ├── package.xml
    ├── Readme.md
    ├── rosdoc.yaml
    └── script

and the doc folder contains:

    ├── conf.py
    ├── html
    │   ├── genindex.html
    │   ├── index.html
    │   ├── index-msg.html
    │   ├── msg-styles.css
    │   ├── objects.inv
    │   ├── search.html
    │   ├── searchindex.js
    │   ├── _sources
    │   └── _static
    ├── index.rst
    ├── make.bat
    ├── Makefile
    └── manifest.yaml

and the corresponding generated Makefile:

    # Minimal makefile for Sphinx documentation
    #
    # You can set these variables from the command line.
    SPHINXOPTS    =
    SPHINXBUILD   = sphinx-build
    SPHINXPROJ    = comehome_pose_tf2
    SOURCEDIR     = .
    BUILDDIR      = .
    # Put it first so that "make" without argument is like "make help".
    help:
        @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(
    .PHONY: help 
    # Catch-all target: route all unknown targets to Sphinx using the new
    # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
    %: Makefile
        @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)