Gmail is giving me problems.

Gmail of late is giving me few problems when I try to send attachments. And this problem surfaces every time when I try to attach image file in any of format. My Dad who was new to Gmail admired it for its mail management capabilities, but was really bugged when he tried to send attachments. Same happened to me, when I did it, and it is not a computer specific problem as I faced same problem when I tried to mail from my college or my Dad tried to do it from his office. I am here posting the image of problem if any one of you encountered same problem then, and later found solution to it then feel free to post it in comments.