Reproduced with Inkscape 0.48.4 and 0.48+devel r12419 on OS X 10.7.5 if trying to export without having defined any slicer rectangles in the current document (or more precisely: reproduced if the layer 'Web Slicer' is missing in the current document - export fails silently if the layer is present but empty).
Catching the error and returning a message explaining to the user to first create at least one slicer rectangle before applying 'Web > Slicer > Export layout pieces and HTML+CSS code' would be more user-friendly.
Reproduced with Inkscape 0.48.4 and 0.48+devel r12419 on OS X 10.7.5 if trying to export without having defined any slicer rectangles in the current document (or more precisely: reproduced if the layer 'Web Slicer' is missing in the current document - export fails silently if the layer is present but empty).
Catching the error and returning a message explaining to the user to first create at least one slicer rectangle before applying 'Web > Slicer > Export layout pieces and HTML+CSS code' would be more user-friendly.
Basic description of the features of the extension: tavmjong. free.fr/ INKSCAPE/ MANUAL/ html/Extensions -Web.html# Extensions- Web-Slicer>
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