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NoClassDefFoundError when trying to install my mod


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I'm writing a Forge mod, and all goes well when I run it in eclipse, but I want to give it to some friends so they can test it out. I've tried to install it on a clean FML installation, and it actually tries to load the mod but fails with a java.lang.NoClassDefFoundError for the first custom block I tried to load. As far as I can tell, there doesn't appear to be anything wrong when compared to other mods in zip/jar format... Any ideas as to what is happening here?

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