scriptLanguage: bash not working

[mahaase]

$ bob dev ... 

An internal Exception has occured. This should not have happenend.
Please open an issue at https://github.com/BobBuildTool/bob with the following backtrace:
Bob version 0.18.2.dev42+gf205ad9
Traceback (most recent call last):
  File "C:/bob/pym/bob/scripts.py", line 147, in catchErrors
    ret = fun(*args, **kwargs)
  File "C:/bob/pym/bob/scripts.py", line 248, in cmd
    ret = cmd(args.args, bobRoot)
  File "C:/bob/pym/bob/scripts.py", line 29, in __develop
    doDevelop(*args, **kwargs)
  File "C:/bob/pym/bob/cmds/build/build.py", line 296, in doDevelop
    commonBuildDevelop(parser, argv, bobRoot, True)
  File "C:/bob/pym/bob/cmds/build/build.py", line 137, in commonBuildDevelop
    recipes.parse()
  File "C:/bob/pym/bob/input.py", line 3398, in parse
    self.__parse()
  File "C:/bob/pym/bob/input.py", line 3417, in __parse
    recipe.resolveClasses()
  File "C:/bob/pym/bob/input.py", line 2219, in resolveClasses
    glue = getLanguage(self.__scriptLanguage).glue
  File "C:/bob/pym/bob/languages.py", line 582, in getLanguage
    return LANG[language]
KeyError: 'bash'