Can someone help with this error please? Thanks!

I am getting spam from my console with this message and i can't find out what i need to do, please help me:

15.03 07:38:18 [Server] INFO at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit_dev.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]