Oracle WebApp 11i - web_image_link fail in other systems

Hi ,

I've developed a Oracle WebApp 11i script using VuGen 11.52.

The script is working fine in my PC, however the same script fails in other PCs.

The error was at a step where the user expands a tree, using web_image_link function

Action.c(28): Error -26227: Image not found  [MsgId: MERR-26227]

the actual step is 

web_image_link("expand_3", 
        "Snapshot=t14.inf", 
        DESCRIPTION, 
        "Alt=expand", 
        "ID=", 
        "Name=", 
        "Ordinal=12", 
        ACTION, 
        "ClickCoordinates=100,100", 
        //"ClickCoordinates=4,8", 
        LAST);

I've changed the Co-ordinates to 100,100 to find what wrong as the other system is having a smaller screen. but there was no issue with whatever co-ordinates I change, as far as in my PC.

How exactly this function works, what are the things I should look into to fix this issue?

Thanks