UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: ordinal not in range(128)

Starting arm (64816a180a29797dad6d11f8649db08632670d6a) results in a stacktrace -

arm :: (master) »  ./arm                                                                                                                                                                      ~/arm  1 ↵ 
Traceback (most recent call last):
  File "./src/starter.py", line 458, in <module>
    _loadConfigurationDescriptions(pathPrefix)
  File "./src/starter.py", line 162, in _loadConfigurationDescriptions
    util.torConfig.loadOptionDescriptions()
  File "/home/gsathya/arm/src/util/torConfig.py", line 195, in loadOptionDescriptions
    line = uiTools.getPrintable(line)
  File "/home/gsathya/arm/src/util/uiTools.py", line 127, in getPrintable
    line = line.replace('\xc2', "'")
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: ordinal not in range(128)

Setting priority to major since I'm not even able to start arm.