uicontrol text background color - value must be numeric

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Hi guys, Am writing code to display a temporary figure displaying a generic 'file loading' msg while processing continues in background.

Am trying to change the background color of the text uicontrol that displays the msg so that it matches the background of the figure, but I get the following error msg

if true
  % code
Error using uicontrol
Value must be numeric
end

here is a snippet of the code in question, the line beginning 'uicontrol' is the culprit, but I can't see whats wrong with the value for backgroundcolor.

if true
hFig = figure('Menubar','none', 'Resize','off', ...
      'Units','pixels', 'Position',[300 300 225 imgH*1.3]);
  movegui(hFig,'center')
  hAx = axes('Parent',hFig, ...
      'Units','pixels', 'Position',[(imgW*1.3-imgW)/2 (imgW*1.3-imgW)/2 imgW imgH]);
  hImg = imshow(img(:,:,:,1), map, 'Parent',hAx);
  uicontrol('Parent',hFig,'Style','text','BackgroundColor',[0.8 0.8 0.8],...
        'Units','normalized','Position',[0.35 0.42 0.5 0.4],...
        'String','Loading image(s): Please wait...','FontSize','12');
end