ServerHelpPlz!!

Whenever I restart my server i get this message.

07.09 00:40:30 [Server] INFO at net.minecraft.server.PropertyManager.a(PropertyManager.java:65)
07.09 00:40:30 [Server] INFO at net.minecraft.server.PropertyManager.savePropertiesFile(PropertyManager.java:76)

It was working fine the other day but it started giving me this message yestrday and today.

Help Plz