cannot start zim

I started to use ZIM, but it stopped working. I did not find any hint in the system logfiles. When I try to start zim in the terminal, the following comes back:

klaus@klaus-HP-Pavilion-15-Notebook-PC:~$ zim %f Traceback (most recent call last): File "/usr/bin/zim", line 42, in <module> import zim File "/usr/lib/python2.7/dist-packages/zim/__init__.py", line 147, in <module> locale.setlocale(locale.LC_ALL, '') File "/usr/lib/python2.7/locale.py", line 581, in setlocale return _setlocale(category, locale) locale.Error: unsupported locale setting klaus@klaus-HP-Pavilion-15-Notebook-PC:~$

Do you have a solution?

Klaus