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
Every time I try to launch mc i get this message i tried with java 9 but that was not supported. it was working fine until today.

Is there any way to fix this problem

(i don't have any experience in java or coding in general and this is one of my first posts )