tensorboard --logdir ckpt/ --port 8012

E1221 10:23:28.750255 MainThread program.py:201] Tensorboard could not bind to unsupported address family ::
E1221 10:23:28.750255 140156928575296 program.py:201] Tensorboard could not bind to unsupported address family ::
ERROR: Tensorboard could not bind to unsupported address family ::

python -c 'from tensorboard import version; print(version.VERSION)'
1.12.0