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Client Problem? Or can't find thread for solution

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Client> Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/client/main/Main

Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.client.main.Main

Client> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)

Client> at java.security.AccessController.doPrivileged(Native Method)

Client> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

Client> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

Client> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Game ended with bad state (exit code 1)



I followed the video I found posted saying to make a new folder, place the changed .jar and a .json in the folder, rename the .jar, the,json and the thing in the .json video. my modded .jar is just the 1.6.1.jar with forge version and copied the .json 1.6.1 to the new folder as well. I created a new profile that used the new folder. Then the message above is what I get when I hit play.

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