I was doing the molecular level quest at Boston airport, and all the special things have been built (beam emitter, control panel, and that weird radio thingy). All i need is enough power to fire it up, everything is connected to one power grid. The problem is: I cannot build another medium generator. I have the resources, and I am allowed to build generators in other places (the castle, red rocket truck stop etc) but whenever i go to Boston airport, I cannot build the generator. Any solutions?

sometimes the resource stockpile is bugged.

Get more resources for that type of generator.

I've had this bug my self, where it says i have enough resources, when i actually dont.

Once i got more resources, i was able to build it.