kivy-01-ValueError: invalid interpolation

>>> import kivy
[WARNING           ] [Config      ] Older configuration version detected (0 instead of 14)
[WARNING           ] [Config      ] Upgrading configuration in progress.
 Traceback (most recent call last):
   File "<pyshell#3>", line 1, in <module>
     import kivy
   File "C:\Python34\lib\site-packages\kivy\__init__.py", line 306, in <module>
     from kivy.config import Config
   File "C:\Python34\lib\site-packages\kivy\config.py", line 670, in <module>
     Config.setdefault('kivy', 'log_name', 'kivy_%y-%m-%d_%h_.txt')
   File "C:\Python34\lib\site-packages\kivy\config.py", line 452, in setdefault
     self.set(section, option, value)
   File "C:\Python34\lib\site-packages\kivy\config.py", line 421, in set
     ret = PythonConfigParser.set(self, section, option, e_value)
   File "C:\Python34\lib\configparser.py", line 1167, in set
     super().set(section, option, value)
   File "C:\Python34\lib\configparser.py", line 872, in set
     value)
   File "C:\Python34\lib\configparser.py", line 382, in before_set
     "position %d" % (value, tmp_value.find('%')))
 ValueError: invalid interpolation syntax in 'kivy_%y-%m-%d_%h_.txt' at position 5

kivy-02-working after change

>>> ================================ RESTART ================================
>>> import kivy
[WARNING           ] [Config      ] Older configuration version detected (0 instead of 14)
[WARNING           ] [Config      ] Upgrading configuration in progress.
[INFO              ] [Logger      ] Record log in C:\Users\cheche\.kivy\logs\kivy_16-05-17_0.txt
[INFO              ] [Kivy        ] v1.9.1
[INFO              ] [Python      ] v3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)]
>>> ================================ RESTART ================================
>>> import kivy
[INFO              ] [Logger      ] Record log in C:\Users\cheche\.kivy\logs\kivy_16-05-17_1.txt
[INFO              ] [Kivy        ] v1.9.1
[INFO              ] [Python      ] v3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)]
>>> 

kivy-03-config.ini

[kivy]
keyboard_repeat_delay = 300
keyboard_repeat_rate = 30
log_dir = logs
log_enable = 1
log_level = debug
log_name = kivy_%%y-%%m-%%d_%%_.txt
window_icon = 
keyboard_mode = 
keyboard_layout = qwerty
desktop = 1
exit_on_escape = 1
pause_on_minimize = 0
config_version = 14

[graphics]
display = -1
fullscreen = 0
height = 600
left = 0
maxfps = 60
multisamples = 2
position = auto
rotation = 0
show_cursor = 1
top = 0
width = 800
resizable = 1
borderless = 0
window_state = visible
minimum_width = 0
minimum_height = 0

[input]
mouse = mouse
wm_touch = wm_touch
wm_pen = wm_pen

[postproc]
double_tap_distance = 20
double_tap_time = 250
ignore = []
jitter_distance = 0
jitter_ignore_devices = mouse,mactouch,
retain_distance = 50
retain_time = 0
triple_tap_distance = 20
triple_tap_time = 375

[widgets]
scroll_timeout = 250
scroll_distance = 20
scroll_friction = 1.
scroll_stoptime = 300
scroll_moves = 5

[modules]

kivy-04-README.md

This is the GIST if this issue.