StorageSelection must contain a callable or an extended callable (with arguments) as impl

[Avtonom]

/vendor/mathielen/import-engine/src/Mathielen/ImportEngine/Storage/Provider/ServiceStorageProvider.php:41 is_callable($callable) return false

because:

var_dump(array_keys($callable)); array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) }

It is necessary

unset($callable[2]);