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Error building on windows

See original GitHub issue

Don’t know if this is anything related to windows or that I did something wrong. But i get the following error while building:

Building OperatorMonoLig-Book
Dumping ".\original\OperatorMono-Book.otf" to ".\original\OperatorMono-Book.ttx"...
Dumping 'GlyphOrder' table...
Dumping 'head' table...
Dumping 'hhea' table...
Dumping 'maxp' table...
Dumping 'OS/2' table...
Dumping 'name' table...
Dumping 'cmap' table...
Dumping 'post' table...
Dumping 'CFF ' table...
Dumping 'GPOS' table...
Dumping 'GSUB' table...
Dumping 'hmtx' table...
Dumping 'DSIG' table...
Reading original font file ./original/OperatorMono-Book.ttx
Patching names
Patching glyphs
Patching gpos
Patching gsub
Patching hmtx
Patching charstrings
Writing ligature font file ./build/OperatorMonoLig-Book.ttx
Done
Compiling ".\build\OperatorMonoLig-Book.ttx" to ".\build\OperatorMonoLig-Book.otf"...
Parsing 'GlyphOrder' table...
Parsing 'head' table...
Parsing 'hhea' table...
Parsing 'maxp' table...
Parsing 'OS/2' table...
Parsing 'name' table...
Parsing 'cmap' table...
Parsing 'post' table...
Parsing 'CFF ' table...
Parsing 'GPOS' table...
Parsing 'GSUB' table...
Parsing 'hmtx' table...
Parsing 'DSIG' table...
ERROR: Unhandled exception has occurred
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\fontTools\ttx.py", line 389, in main
    process(jobs, options)
  File "c:\python27\lib\site-packages\fontTools\ttx.py", line 363, in process
    action(input, output, options)
  File "c:\python27\lib\site-packages\fontTools\misc\loggingTools.py", line 372, in wrapper
    return func(*args, **kwds)
  File "c:\python27\lib\site-packages\fontTools\ttx.py", line 281, in ttCompile
    ttf.save(output)
  File "c:\python27\lib\site-packages\fontTools\ttLib\__init__.py", line 221, in save
    self._writeTable(tag, writer, done)
  File "c:\python27\lib\site-packages\fontTools\ttLib\__init__.py", line 657, in _writeTable
    self._writeTable(masterTable, writer, done)
  File "c:\python27\lib\site-packages\fontTools\ttLib\__init__.py", line 660, in _writeTable
    tabledata = self.getTableData(tag)
  File "c:\python27\lib\site-packages\fontTools\ttLib\__init__.py", line 671, in getTableData
    return self.tables[tag].compile(self)
  File "c:\python27\lib\site-packages\fontTools\ttLib\tables\C_F_F_.py", line 20, in compile
    self.cff.compile(f, otFont, isCFF2=False)
  File "c:\python27\lib\site-packages\fontTools\cffLib\__init__.py", line 108, in compile
    topDict.recalcFontBBox()
  File "c:\python27\lib\site-packages\fontTools\cffLib\__init__.py", line 2341, in recalcFontBBox
    bounds = charString.calcBounds()
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 984, in calcBounds
    self.draw(boundsPen)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 979, in draw
    extractor.execute(self)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 301, in execute
    rv = handler(index)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 345, in op_callgsubr
    self.execute(subr)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 301, in execute
    rv = handler(index)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 345, in op_callgsubr
    self.execute(subr)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 301, in execute
    rv = handler(index)
  File "c:\python27\lib\site-packages\fontTools\misc\psCharStrings.py", line 634, in op_vvcurveto
    dya, dxb, dyb, dyc = args[i:i+4]
ValueError: need more than 2 values to unpack
(Hit any key to exit)

Any idea what went wrong? I have the following versions:

Python 2.7.12 Node 8.9.0

I only put in the OperatorMono-Book.otf in the original folder