wrong image source, no error for debug?

I am new to GWT and I follow the tutorial
http://code.google.com/webtoolkit/doc/latest/tutorial/style.html
and
add the image by
<img src="images/GoogleCode.png" />

but I find the image cannot be shown on my browser, finally I find
that the image is not saved in that path "images/GoogleCode.png", but
due to no any error message, it is quite difficult to debug.

is there any debug message shown for easier debug?

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