problems with org-edit-special and python

[Dirk Scharff <dirk.scharff@googlemail.com>]

Hi all!

I'm fairly new to emacs (and org-mode :)), so I'm sorry in advance for eventually missing something completely obvious. While I kind of expect my problem to be something with my emacs setup it does only happen with org-mode so I'm posting it here.

My test file (for learning purposes) contains the following (empty) code-block: 
#+source : the_beginning
#+begin_src python
  
#+end_src

When I try to run org-edit-special (C-c ') in the python source block an empty buffer is opened as expected. My mini-buffer states the following:
"Language mode 'python-mode' fails with: "Invalid file-name". 
Trying to call python-mode manually in the new buffer doesn't work. (It works fine in other buffers). I can't leave the new buffer by using C-c' again. 

I tried the same with a latex code block and it worked without problems. 

I'm quite satisfied with my emacs python setup, which seems to run perfectly fine on its own. 

I have to admit I don't even know where to start for resolving this. Can someone point me in the right direction? 

best regards,
Dirk