Index is out of bounds

Our countdown to project ivy has just returned an unhandled exception. We have passed zero and we're counting upwards.
On a side note we're also (4 days) late on moving-to-a-new-house project. I'm sure you'll notice that neither of these is my fault!
But being a bit late in a project is nothing new to us software developers. Now why is that? I'm sure we've all read books on project estimations, multiplied our estimates by pi, threatened to quit if project scope gets out of hands again. Still none of this makes a difference. The problem is that projects get late by the actions (or lack of actions) of people who have no vested interest in meeting the deadline. The guys that pour concrete don't care about me moving in. My boss keeps forgetting I have a life. And I guess "ivy" will come out whenever she's ready and isn't aiming for the due date.