1.9.2 won't launch properly

Before I was able to use 1.9.2 but whenever I try to launch it now this message comes up:
"Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
Error: Could not find or load main class net.minecraft.client.main.Main"
When I launch again I go into 1.9.2. and I have already re-downloaded the launcher. Is there anything I can do to fix this?