Extra Builder - error while Build and creating tables

Hello,
after creating the package, objects and fields, save the schema,
when i try to build (create tables), i’ve got a popup with this error :
(no matter the option)

Possible Error

Error, Validate ‘bootstrap.php’: Class still does not exist after autoloader registration: MusiQlive\Playlist

And the creation failed.
What can be the cause ?

(modx 3.1.0pl, extrabuilder 2.0.0pl)