Error when setup dreamfactory

i got this error when i enter command “php artisan df:setup
SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes (SQL: alter table user add unique user_email_unique(email))”
i need help please

Try this : https://laravel-news.com/laravel-5-4-key-too-long-error