Building Upgrades - Minor Bug?

Dunno if this bug has already been highlighted:

In the tutorial (level 11 or 12 I believe) you are tasked with upgrading a building. When you mouse-over the material requirements to upgrade a building, it shows how much stone, wood etc. is required.
However the mouse-over reveals that you require HARDWOOD. At such an early level you haven't progressed as far as obtaining Hardwood!!! And in-fact are able to upgrade a building using your supply of Pine Wood.
Whilst this may not be a major bug - it is certainly misleading, especially to a novice.

Which buiding are you talking about?

Some buildings require hardwood whilst other use pinewood for a level 2 upgrade.
Make sure you're trying to upgrade the right one.

Not sure if you've quite understood what I meant:
In the tutorial levels (level 11 or 12 I believe) one of the quests is to upgrade a building. Bearing in mind at level 11 or 12 you're only really just starting out and have access to a very limited number of buildings.
On receiving this quest I moused over the requirements to upgrade a building: Woodcutter, Mason, Sawmill, Tree Planter etc. They all stated that the requirement was for HARDWOOD (Not Pine Wood). I decided to select the Sawmill, even though I had no hardwood - only Pine Wood. The building upgraded!
The point being:
I believe the the requirement is and should be Pine Wood, but it's incorrectly specified though as Hardwood (Mouse-over).
At level 11 or 12 - You do not have access to buildings to produce hardwood, only Pine Wood.

I doubt that you can upgrade while requirements are missing. Also, it is a little suspiciously, that you've said "mouse over" while the upgrade requirements are told in the building information pane for which you have to click on the building.

Here my good suggestions: 1) perhaps a daily quest, that is, not in the tutorial quest line? 2) Perhaps, you had got the hardwood and marble by other means? 3) last not least: don't worry, when something such confusing would exist, more people would speak up.

That should be a famous quote: if such a confusing thing would exist, we wouldn't know because we would be too confused to realize.

By the time you get to that quest, you have gotten enough resources from quests to do one upgrade.

also you can make hardwood at the provision house