Loading error after preload

[C_Stefano]

Hi, after this:

        cc.director.preloadScene('boot_level', function (error, asset) {
            
            cc.tween(cc.GAMEMANAGER.node).delay(1.0).call((target)=>{
                cc.director.loadScene('boot_level');
            }).start();
        });

we have this error:

somebody could help us to understand what happened?

Thanks!

Stefano