Using the --importer=json option with drush pir errors out...

[bisonbleu]

When trying to import products using the book's custom drush command (ProductCommands.php) with the code from Chapter 17, drush pir --importer=json errors out:

[error] The specified importer does not exist.

[upchuk]

Hello,

It means that you didn't create an importer whose machine name is "json".