Web Forms :: Uploading Picture - Error "picture Could Not Be Attached"

I ve an application dat am working on. The section of the upload picture works perfectly on the development environment and also on a test server but the issue comes up when it was hosted life. I started geting an error dat says picture could not be attached. I ve a folder cald Passport and dis ve been working for me on befor now but i dont now the reason y its not working now.

protected void btnUpload_Click1(object sender, EventArgs e)
{
Boolean fileOK = false;
String fileExtension = string.Empty;
String path = Server.MapPath("~/Passport/");
if (fuPassport.HasFile)
{
fileExtension = System.IO.Path.GetExtension(fuPassport.FileName).ToLower();
String[] allowedExtensions = { ".gif", ".png", ".jpeg", ".jpg" };
if (allowedExtensions.Contains(fileExtension))
{
fileOK = true;
}
}
else
{
Utilities.PortalMessage = "Please attach an image file.";
return;
}
if (fileOK)
{
try
{..............................