We need to see what is in your Development Console, which can be found on the second tab of the launcher.
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I tried to play minecraft today, and it says:
Could not find or load main class net.minecraft.client.main.Main
can someone help me?
Sincerely,
Yotacraft.
First, copy all of the text: click on the text, then press Ctrl+A then Ctrl+C. Then paste it in spoiler tags in a reply for us to see.
How to use spoiler tags:
Stu