Problem with Meta

Hey guys,

I’m making my new website and making half-plugin to do simple metaboxes.
The code is interesting since I was able to upload and stuff and it worked in the past but now I don’t know why it’s not working.

PROBLEMS:
Notice: Undefined index: sds_meta_box_nonce in meta.php (just accessing “Add new”)

Notice: Undefined index: sds_meta_box_nonce in meta.php
Notice: Undefined index: sds_meta_box_nonce in meta.php
Warning: Cannot modify header information – headers already sent by …

This happens when I try to publish a page, post…

Here is the pastebin: http://pastebin.com/Wy2U27Fu