Error when calling Swoop.EagleFile

[yenyi]

Hi,

When calling Swoop.EagleFile, it shows the following error message.
My python version is 2.7.15 and OS is Win10.
Thanks!

File "eagle2bookshelf2012.py", line 280, in run_conversion
brd = Swoop.EagleFile.from_file(brd_file)
File "C:\Users\Yen-Yi\AppData\Local\Programs\Python\Python27\lib\site-packages\Swoop\Swoop.py", line 1222, in from_file
n = cls.from_stream(cls.get_board_file_type(), f, bestEffort, DRUFile, pickle)
File "C:\Users\Yen-Yi\AppData\Local\Programs\Python\Python27\lib\site-packages\Swoop\Swoop.py", line 1184, in from_stream
ef.DRUFile = DRU.DRUFile(s)
File "C:\Users\Yen-Yi\AppData\Local\Programs\Python\Python27\lib\site-packages\Swoop\DRU.py", line 20, in init
self.open(stream, filename=filename);
File "C:\Users\Yen-Yi\AppData\Local\Programs\Python\Python27\lib\site-packages\Swoop\DRU.py", line 43, in open
assert m is not None, "Unknown value format in '{}': {}".format(filename,values[i])
AssertionError: Unknown value format in 'None': 0.035mm