Summer Event: Using upgrade kitsGot a upgrade kit but cannot upgrade it! Why?
Please check in your inventory if it's a Crow's Nest or an upgrade kit. You cannot build a Crow's Nest with an upgrade kit, and in order to upgrade your Crow's Nestyou will need an upgrade kit:
|The Crow's Nest - Level 1||The Crow's Nest Upgrade Kit|
The same applies to The Ship, and other upgradable buildings.