Fatal error after loading image and drawing texture

Hey guys, I'm trying to implement a simple script to display images. The images load fine and are drawn to the screen but after about 15 seconds a fatal error occurs and Unity crashes. Here's my code stripped down... void Start () { xu = Screen.width; yu = Screen.height; www = new WWW(@"file://D:\Slides\Assets\Final Renders\IM_00.jpg"); } void OnGUI() { GUI.DrawTexture(new Rect(0,0,xu/2,yu), www.texture, ScaleMode.ScaleToFit); } Here is the error I'm getting... ![alt text][1] [1]: /storage/temp/25865-fatalerror.png When the 'GUI.DrawTexture(new Rect(0,0,xu/2,yu), www.texture, ScaleMode.ScaleToFit);' line is commented out no error occurs. The image is a JPEG and roughly 140KB. If anyone can point me in the right direction as to what I'm doing wrong it will be greatly appreciated! Cheers