I'm trying to start the tensorflow tensorboard. This based on a simple model. But when executing

```
tensorboard --logdir output/
```

I get this error:

The image shows that tf.estimator is not installed, but check that part, and if it is installed correctly.

I have googled a lot but I have not been able to solve this problem I have the version of tensorflow 1.12 (which is the most updated). How could I solve this problem?

Thank you in advance