Ksюн, could another hero have been on the ship? You can only summon a free ship. I completed this mission with a Warrior in version 3.0 and with a Hero in version 3.1. In both cases, the ship was summoned, and the shipyard worked properly.

General advice for all unclear quests: click on it with the mouse - a detailed description of what needs to be done will appear on the right side of the screen. If it's the first mission, you need to go to the place where the key is made from two halves.