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How do I fix Java Exception Error occurred?

I want to install a mod but java says "Java Exception Occured" and I have the right one for the right version.I use a copy of minecraft from my friend and it is on 1.4.6

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I read online that this may be a good fix! I would give this a try if I was having the same issue.

"A mod, kind of like a mod manager, that stops conflicts with mods that alter rendering, recipes, add entities, gui, smeltables or fuel. If you?re a modder, feel free to decompile this and learn how to make mods work with it. Inherit BaseMod and override any methods as necessary. The mod?s main class file should be prefixed with ?mod_?. Read the Javadoc for information on methods available.Installation:Windows: 1) Open up %appdata%, if you don?t know how to do this, start>run, then type in %appdata%
2) Browse to .minecraft/bin
3) Open up minecraft.jar with WinRAR or 7zip.
4) Drag and drop the necessary files into the jar.
5) Delete the META-INF folder in the jar.
6) Run Minecraft, enjoy

Macintosh: 1) Go to Applications>Utilities and open terminal.
2) Type in the following, line by line:cd ~
mkdir mctmp
cd mctmp
jar xf ~/Library/Application Support/minecraft/bin/minecraft.jar 3) Outside of terminal, copy all the files and folders into the mctmp directory.
4) Back inside terminal, type in the following:rm META-INF/MOJANG_C.*
jar uf ~/Library/Application Support/minecraft/bin/minecraft.jar ./
cd ..
rm -rf mctmp 5) Run Minecraft, enjoy!"
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Helpful (1) Fun Thanks for voting Comments (3)
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Thank you so much:)
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I don't see winRAR
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winrar is an application that runs compressed files. Think of it this way, it makes it easier to ship ten items if you put them I'm a box. It keeps all the items together and the receiver gets the box. Winrar opens that box to get the items out. Winrar opens the compressed file that holds the individual files you need.

Winrar download -

Though the Winrar application itself is safe, don't be fooled. All .rar files are not safe. The "box" can contain anything, viruses etc.
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