Hello,

Look like there is a small bug in the script. Will include the fix in the next update, but till then you can do this: 

Open file stachethemes_event_calendar\admin\class\class.wc-booking.php and under line 18 add this line of code:

$this->set_virtual(true);

So the whole function starting on line 14 should look like this:

public function __construct($product) {
        $this->product_type = 'stec_bookable';
        parent::__construct($product);
        
        $this->set_virtual(true);
}

This fix will be included in the next update.

I'm glad everything is okay now!

I'm really sorry for the inconvenience caused, sometimes users find bugs that elude us. I'm will make sure the bug is fixed with the next updated currently in development.