MATLAB: Error in imshow

imshow

I get the following error when i tried to used imshow.
Previously it was working. I tried with other system its working. I tried with different images too. but only with my system it shows this error.
A = imread('rone.bmp');
figure;
imshow(A)
??? Attempt to call constructor image with incorrect letter case.
Error in ==> basicImageDisplay at 9
hh = image(xdata,ydata,cdata, ...
Error in ==> imshow at 246
hh = basicImageDisplay(fig_handle,ax_handle,...
can i know is there a problem with matlab?? Do i need to reinstall?
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