Assertion Failure - SimpleGame Part 2

Assertion Failure - SimpleGame Part 2
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Been working through the code here ( which is a port of the tutorial on ray wenderlich’s simple game.

My code is just a copy of the code available at

The code builds without any errors, but when I try to run it, I receive an assertion failure error at the finishShoot function:

void HelloWorld::finishShoot()
_nextProjectile = NULL;

Anyone face similar issues.
I am running on Windows 7, using VS Express 2010 and cocos2d-x 2.1.0