Warning while loading images from local machine

Why do I get this message when I am trying to load images from local
machine
in my GWT application?

[WARN] 404 - GET /Images%5Cbirthday1.jpg (127.0.0.1) 1408 bytes
Request headers
Host: 127.0.0.1:8888
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:
1.9.2.16) Gecko/20110319 Firefox/3.6.16 PBSTB/1.2
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://127.0.0.1:8888/Greetings.html?gwt.codesvr=127.0.0.1:9997
Response headers
Content-Type: text/html; charset=iso-8859-1
Content-Length: 1408

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