pkg_resources.DistributionNotFound: The 'pipenv==2018.10.13' distribution was not found and is required by the application

I had the same problem. You should reinstall pipenv using the same package manager you used the first time.

If the installation was done using pip, then:
```
pip uninstall pipenvpip install pipenv
```
If you are using brew, then you must run the commands exposed by Andrei
```
brew uninstall pipenvbrew install pipenv
```

To check if pipenv installation was successfully completed, run:pipenv --version

brew reinstall pipenv

python python-3.x pip pipenv

This should fix the problem too:

pipenv --rmpipenv checkpipenv sync

I run into this problem from time to time when updating python using anaconda.

CodeHunter