Error message about distance to cut after an acquisition

[raacampbell]

The following error appeared after an acquisition that run successfully and ended apparently gracefully:

Closed log files
Finished data acquisition

Disarmed scanner: 06-Nov-2020 05:13:38
Requested 150 slices: this is 7.50 mm thick but only 4.04 mm is possible. You can cut a maximum of 79 slices.
Invalid or deleted object.

Error in images.roi.Rectangle/get.Position

Error in BakingTray.gui.acquisition_view/areaSelector (line 35)
    rect_pos = (roi.Position);

Error in BakingTray.gui.acquisition_view/buildFigure>@(varargin)obj.areaSelector(varargin{:}) (line 226)
        'Callback', @obj.areaSelector);
 
Error while evaluating DestroyedObject Callback.

It may well not be a problem, but if it recurs it should be fixed.