Error occurred when used bunny in jupyter notebook

[huyhoang17]

for _ in bunny(range(10)):
    sleep(0.1)

  0%|          | 0/10 [00:00<?, ?it/s]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-92-b5d041156ee6> in <module>
----> 1 for _ in bunny(range(10)):
      2     sleep(0.1)

~/.../lib/python3.5/site-packages/bunny/bunny.py in __iter__(self)
     86 """, fp_write=getattr(self.fp, 'write', sys.stderr.write))
     87 
---> 88             tqdm.write("\r" + " " * self.ncols + "\n" * 8)  # make space for bunny
     89 
     90             for obj in iterable:

TypeError: can't multiply sequence by non-int of type 'NoneType'

[bheinzerling]

Looks like self.ncols is None. Does this error still occur if you execute all cells in the notebook in the correct order from top to bottom?