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 )
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its doing this for me for versions 1.15.2 and every version and will let me play minecraft online but not offline

the 2 files that are connected to Rel1X_Dem0n is my account
please help mojang
Why is it "resolved" if there isnt any fix... Look i had problems joining multiplayer servers... i had some kind of error that was recorded happening on minecraft 1.7 (internal exception:io.netty.handler.codec.Corrupted Frame Exception: length wider than 21-bit
or
internal exception:io.netty.handler.codec.DecoderException: java.io.IOException: Bad packet id xxx(X stands as random nubmer...)) But now i was playing minecraft 1.12 or minecraft 1.8.9... But when I deleted my whole minecraft with .minecraft map.... I downloaded it back and opened it it makes .minecraft map with 3 folders (Libaries, server resource.. and versions) and i have an a lauuncher_profiles.json But thats all and when i hit run i get the (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
) error... Dont you get it before i couldnt join servers now i cannot enter minecraft... I wanna know it this may be affected by windows vista or it shouldnt be happening... pls im really confused...