Galacticraft encountered an error!

[SolSavvy]

The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/api/event/oxygen/GCCoreOxygenSuffocationEvent$Pre

this is the message displayed after trying to launch Minecraft

 

[QuadShot]

Please post the entire log file to pastebin or equivalent, the provide a link to it.