You are getting that error because steamui.dll simply does not exist.
To fix:
1. Delete steam.cfg (steam text document in your pic)
2. Start Steam, let it update.
3. Close Steam, crack again.
4. THANK ME 4 HELPING.
HALF OF YOUR STEAM FILES, AND ALL OF YOUR GAMES, ARE MISSING. THE SCREENSHOT DOES NOT SHOW A STEAMAPPS FOLDER.