I am trying to upload samples from my memory card and i'm putting them in the root folder but for some reason when i try to upload on my SP-404 it says EMP. the files are 16 bit .aif, I cant seem to figure out what is going on

Please stop asking the same question in different posts.

You have 3 options.
1. Read the manual
2. Sample the sounds directly into your SP
3. Use the search function on the forum

3.5 Or wait for one of your other posts to get answered.