imresize function in SliceViewer

Hello, I got the following error when trying to load the overlay a T map generated with the 2 sample T test function. Do you have any suggestions on how to fix it? I am using Matlab 2011b with the Image Processing and Statistics toolboxes. Thank you. Undefined function 'imresize' for input arguments of type 'double'. Error in rest_sliceviewer>AddOverlay (line 2924) theOverlay =imresize(theOverlay, floor([(size(theOverlay, 1)-1)*Xvol+1, (size(theOverlay, 2)-1)*Xvol+1]*theMagnifyCoefficient)); Error in rest_sliceviewer>SetView_Orthogonal (line 1471) theSagittalImg =AddOverlay('Sagittal' ,AConfig, theSagittalImg,theMagnifyCoefficient); Error in rest_sliceviewer>SetImage (line 1387) Result =SetView_Orthogonal(AConfig); Error in rest_sliceviewer (line 453) REST_SliceViewer_Cfg.Config(theCardinal) =SetImage(REST_SliceViewer_Cfg.Config(theCardinal)); Error in rest_sliceviewer (line 527) rest_sliceviewer('ChangeOverlay', AFigHandle); Error while evaluating uicontrol Callback