Question Console Warning

I am trying to make a server where I never have any errors or warnings as soon as I started with no plugins I got the warning

C:\Users\Nathan\Desktop\Minecraft\Servers\Mainserver\Mainserver Hub>java -Xmx204
8M -jar craftbukkit.jar -o true
Loading libraries, please wait...
[10:42:54 INFO]: Starting minecraft server version 1.7.10
[10:42:54 INFO]: Loading properties
[10:42:54 INFO]: Default game type: SURVIVAL
[10:42:54 INFO]: Generating keypair
[10:42:54 INFO]: Starting Minecraft server on *:25565
[10:42:54 INFO]: This server is running CraftBukkit version git-Bukkit-1.7.9-R0.
2-20-g0b2ed13-b3108jnks (MC: 1.7.10) (Implementing API version 1.7.10-R0.1-SNAPS
HOT)
[10:42:54 INFO]: Preparing level "world"
[10:42:54 INFO]: Preparing start region for level 0 (Seed: -4741524361715316419)

[10:42:55 WARN]: Could not get information about this CraftBukkit version; perha
ps you are running a custom one?: FileNotFoundException
[10:42:55 INFO]: Preparing start region for level 1 (Seed: -4741524361715316419)

[10:42:55 WARN]: Could not get latest artifact information: FileNotFoundExceptio
n
[10:42:55 INFO]: Preparing start region for level 2 (Seed: -4741524361715316419)

[10:42:56 INFO]: Server permissions file permissions.yml is empty, ignoring it
[10:42:56 INFO]: Done (1.756s)! For help, type "help" or "?"
>

at 10:42:55 I got 2 WARN signs how do I fix these?