What is the issue?
PDF/UA > Logical Structure > Structure Elements > Figures > Bounding Boxes > Figure element on a single page with no bounding box
What does it mean?
The bounding box of a figure is missing. The figure cannot be rendered correctly in alternate presentations.
How to fix it?
Double-click on the error so that the related figure and figure tag is highlighted. Go to the task pane Properties in axesPDF and add a bounding box by clicking on button "+" at one of the empty attribute fields - for example at the attribute "Left". axesPDF creates automatically a correct bounding box.