MINECRAFT LAUNCHER ISSUES!!!

Whenever I try to play Minecraft, the launcher will load and then disappear, but then it will reappear and this will show up:

Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Could u please fix this?Unable to render embedded object: File (? I REALLY WANT TO PLAY MINECRAFT) not found.!!