New theme using CLI commands

When i`am create a new theme with the command:

$ bin/plugin devtools new-theme

After the request "Please choose a template type" a message appears:
PHP Notice: Undefined variable: output in ... /vendor/symfony/console/Helper/QuestionHelper.php on line 447
PHP Notice: Undefined variable: exitcode in ... /vendor/symfony/console/Helper/QuestionHelper.php on line 447
PHP Warning: exec() has been disabled for security reasons in ... /vendor/symfony/console/Helper/QuestionHelper.php on line 447
PHP Notice: Undefined variable: exitcode in ... /vendor/symfony/console/Helper/QuestionHelper.php on line 449
What could be the problem?

I can't replicate the problem. Which version of the plugin/grav you're using? Latest available?

Me either, but seems your hosting provider has disabled exec() in PHP, probably for security reasons.

Thanks, too, had the idea.