[Vala] Error in allocating memory

[Bharani Deepan <bharanideepan gmail com>]

Hello,
     I am a MCA student from India.For my project i have chosen Digital
image processing.  I am new to vala and have some coding experience in
c#.I have  started my coding.But i am struck with a problem.
 Here is my code

        Gdk.Pixbuf p=new Gdk.Pixbuf.from_file("one1.png");
        int ht=p.get_height();
        int wd=p.get_width();
        txtht1.text=ht.to_string();
        txtwd.text=wd.to_string();
        uchar[] pix=p.get_pixels(); // Error here


When i compile the program i have no errors.
But when i run the program  it crashes with the following error.

GLib-ERROR **: /build/buildd/glib2.0-2.18.2/glib/gmem.c:136: failed to
allocate 4294967295 bytes
aborting...
Aborted

I have no idea what this error means. Can somebody help me. Please.