ValueError: not enough values to unpack (expected 2, got 1)

[be4]

OS: Win10 Pro 64 bit
FLaP version: 0.5.0
I used a normal TeXlive 2018 installation and then installed flap and click (both via pip).

The Source-Code of main.tex and lit.bib was in a directory C:\temp\1 and below there were the directories C:\temp\1\pics and C:\temp\1\sections witj further source files.

I tried:
C:\temp>flap 1/main.tex 1-flapped/output
and
C:\temp>flap 1/main.tex output1

In both cases I got:

FLaP 0.5.0
Traceback (most recent call last):
File "C:\Users\Admin\AppData\Local\Programs\Python\Python36-32\Scripts\flap-script.py", line 11, in
load_entry_point('FLaP==0.5.0', 'console_scripts', 'flap')()
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\click\core.py", line 722, in call
return self.main(*args, **kwargs)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\click\core.py", line 697, in main
rv = self.invoke(ctx)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\click\core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\click\core.py", line 535, in invoke
return callback(*args, **kwargs)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\ui.py", line 102, in main
Controller(OSFileSystem(), Display(sys.stdout, verbose)).run(tex_file, output)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\ui.py", line 43, in run
request.execute()
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\engine.py", line 79, in execute
flattened = self._rewrite(self.read_root_tex, str(self.root_tex_file.resource()))
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\engine.py", line 88, in _rewrite
return parser.rewrite()
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\parser.py", line 78, in rewrite
result += self._rewrite_one()
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\parser.py", line 86, in _rewrite_one
return self._evaluate_one()
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\parser.py", line 138, in _evaluate_one
return self.evaluate_command(str(self._next_token))
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\parser.py", line 164, in evaluate_command
return macro.invoke(self)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\macros.py", line 124, in invoke
return self._execute(parser, invocation)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\macros.py", line 288, in _execute
style_file = self._fetch_style_file(parser, invocation)
File "c:\users\admin\appdata\local\programs\python\python36-32\lib\site-packages\flap\latex\macros.py", line 296, in _fetch_style_file
_, value = each.split("=")
ValueError: not enough values to unpack (expected 2, got 1)

Any help is really appreciated.

Best regards, Bernhard