HT6114 Why can't I install Mavericks on OS X Mountain Lion? I keep getting the message "Cannot install on Macintosh HD"

Why can't i install mavericks on OsX mountain lion? I keep getting the message "Cannot install on Macintosh HD"

You have a Macbook Pro, not a desktop Mac Pro and, since yours is a 2011, it should install.
How much RAM do you have?
And how much empty hard drive space?
Did you get the machine new or did you buy it used with Lion installed?

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