Re: finishing tall-tree house

I tried to build the road to Tall Tree House ages ago but I ran out of time. Now when I go back in I can't complete the remaining tasks and I can't buy a deadline extension. Johnny Zest is nowhere to be seen and I can't access the house to place any trees.

If I try to build the road it says I need to finish the previous construction but none of the buttons are enabled for me to complete it! I'm just going round in circles.

Help?