Unable to go on server... says username not valid. Help!

[awesome101101]

i went onto a server. i exited and went on it again. It said: Failed to verify username! [internal error java.net UnknownHostException: session.minecraft.net]

Please help me. :(

[jwa1]

Do you share your account with anyone? If not, close Minecraft and retry.

[Richs_Yard]

Are you using a Premium Account?

[awesome101101]

nvm now its fixed :D