Why am I getting this error while building App Inventor?

Why my build is getting failed when I enter the command ant MakeAuthKey ?
Can anyone help me?
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did you downloaded the repository or cloned it in you pc

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Downloaded the repository

You need to clone repo to make builder

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But how to do it?

http://josmas.github.io/contributingToAppInventor2/

I saw it but didn't understand

The build system doesn't really like paths with spaces in them. Consider moving your sources to a different location before compiling.

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