nbdev: nbdev_nb2md throws error when called in a notebook

When I tried to call nbdev_nb2md I got the following error, which I don’t know how to handle:

I’m Using nbdev 1.1.11

➜  nb2ltx git:(master) ✗ pip list | grep nbdev
nbdev              1.1.11

An other issue appeared, when I tried to call nbdev_nb2md on the command line. If I try to use the argument --img_path I get an error:

➜  nb2ltx git:(master) ✗ nbdev_nb2md --dest tex --img_path 'tex/images' 10_Code.ipynb
usage: nbdev_nb2md [-h] [--dest DEST] [--use_img USE_IMG] [--replace REPLACE] path_nb
nbdev_nb2md: error: unrecognized arguments: --img_path 10_Code.ipynb

What puzzles me is the [--use_img USE_IMG] in the usage section of the error message. There seems to be a connection to the error message from the notebook because --use_img is mentioned there also . If I execute nbdev_nb2md -h on the command line there is no option --use_img mentioned.

➜  nb2ltx git:(master) ✗ nbdev_nb2md  -h
usage: nbdev_nb2md [-h] [--dest DEST] [--img_path IMG_PATH] [--jekyll JEKYLL] fname

Convert the notebook in `fname` to a markdown file

positional arguments:
  fname                A notebook file name to convert

optional arguments:
  -h, --help           show this help message and exit
  --dest DEST          The destination folder (default: .)
  --img_path IMG_PATH  Folder to export images to (default: )
  --jekyll JEKYLL      To use jekyll metadata for your markdown file or not (default: False)

Having read the contribution guidelines, I tried to call import fastai.utils.collect_env; fastai.utils.collect_env.show_install(1) but was stopped by an error message. Is fastai.utils.collect_env still part of the current fastai version?