Minecraft has a constant error message

When i was testing 14w27b, this error was constantly coming up in the console:

[08:41:10 INFO]: Client> [08:41:10] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:

And:

[08:41:10 INFO]: Client> [08:41:10] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:mob.rabbit.hop

Those two issues were the only console alerts while i was playing.