Scoreboard command not subtracting score

I have a minigame where it tracks lives of the teams. But I have run into a problem. One of my command blocks doesn't remove a point from the Purple team, although the one for Aqua works.

How to recreate
1. Create a scoreboard objective called "lives

/scoreboard objectives add lives dummy Lives

2.set it to the sidebar
3. add the player purple by adding a score to "Purple"

/scoreboard players add Purple lives 10

4. Try to subtract 1 point from it using a command block

/scoreboard players remove Purple lives 1

I get an error message that states there is no name to remove points from.