how to fix "object has no uniform scale"? I try to unwrap uv on first ever 3d model i made in blender which is Baymax., then that message shows up in upper right corner of screen. The uv map looks so grotesque. I already tried remove double but nothing changed. 
Help me pls. 
Thanks. 
Im noob at blender btw.
Select the object and press CTRL+A in 'Object Mode'. Apply the Scale, then try to unwrap.

You can also see the fragment of Blender Guru's tutorial, where he's talking about it:
https://youtu.be/XCEN0qQOsIA?t=345