Skript Error but the skript works?

[Frederik Bugge Jørgensen]

Skript Version: Skript 2.1.2
Minecraft Version: 1.8
---
Full Code:

every 2 second:
    loop all players:
        set {balance.%player%} to placeholder "skript_balance.%player%"

Errors on Reload:

There's no player in a periodical event. set {balance.%player%} to placeholder "skript_balance.%player%"

Info:
The skript works but i really wan't to know why this error is there.

Addons using (including versions):
Umbaska 3.3, SkRayFall, Skellett 1.9.6b, Ersatz

Troubleshooting:

Have you tried searching the docs? Yes
Have you tried searching the forums? No
What other methods have you tried to fix it? Search the web and troubleshooting by my self.

 

[AsuDev]

use loop-player not player when your looping players.