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First, check that your libraries are installed in the correct place. 

It should be under Arduino>Package Contents (need to hold down Control and click Arduino to see the "Show Package Contents")>Contents>Java>Hardware>chipkit-core>hardware

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If this is the case and you are using the beta release of the chipKIT core from 09-03-15, then you may need to replace your platform.txt file with this one: {{:chipkit:platform.txt.zip|}}

The first release of the chipKIT-core had a few lines of the directory lookup missing from platform.txt
The previous MPIDE used platform**s**.txt, but Arduino IDE uses platform.txt
Here's the minor modification you need : 

{{ :chipkit:screen_shot_2015-10-09_at_5.45.15_pm.png?nolink |}}

[[https://www.diffchecker.com/lfenwnzz|How to modify your platform.txt file]]