I succesfully updated Minecraft to the 1.9 version and was able to play it normally for a few days... then, today that I was trying to log in I got the following message:
"Error: no se ha encontrado o cargado la clase principal 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"
Once I saw this I hit again the Play button and an older version of the game was uploaded instead (1.8.9). I closed everything and started all over again and I noticed that it starts updating all the files just as if it were not updated already, but in the end I got the same error message... I also tried to restart the computer to no avail.
Any suggestions?
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resolving to MC-99398, that ticket is a lot more active and has the error in english text

Thanks.