An internal error occurred during: “C / C ++ Index.” Java.lang.NullPointerException

I'm brand new with cocos2d-x.
I had a problem when using cocos2d-x-3.3rc0on OS X 10.9

I create a project using the command line:
python cocos.py new ProjName --package .....
It created for me ProjName.
I am importing proj.androidto build and run, for the first time, everything seems to be all right.

But the next day, when I open it, a problem arose.

"An internal error occurred during: "C/C++ Indexer".java.lang.NullPointerException"

In C/C++ perspectivein Eclipse it looks like an empty project (there is nothing in this project - in Java perspective), and I can’t do anything about it.
proj.ios_macstill works great.
Please help me!

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