ImportError: cannot import name abs

[Aswz]

Hi all!
I got problem while doing step #4.
After using "tensorboard —logdir tf_files/training_summaries &" at first i've seen following error: "AttributeError: 'module' object has no attribute 'CheckpointableBase'"

Reinstalling tensorflow helps with that issue but then i've got next problem:
Now after using "tensorboard —logdir tf_files/training_summaries &" at my terminal, i see this message:
"ImportError: cannot import name abs"

All i could find on the following request in the Internet - is the offer to reinstall tensorflow too. But it isn't a solution.
So, anyone , please, help me with this.
Thanks!