extjs - 404 error when loading a image -

i used ext js framework build web site. there alway image cannot found, means return 404 error. image link "http://localhost/undefined". checked html, , did not found tag link this. wonder if miss steps when using ext js framework, 1 know issues?

have try define ext blank image ??

try :

ext.onready(function(){    ext.blank_image_url = '../extjs/resources/images/default/s.gif';    .....    //your code    ....... }); 

if still not solve.. try update question current code..