Can't Build due to default string

[Lore.Tamora]

Ok, I have two buildings in my custom race that will not build. I have based all of my buildings off of human ones and have just altered them, which has worked for me for the most part. I have created all of my buildings and have found that my tech-tree works for the most part, and have no issues with any of my other buildings besides the two listed below.

The problem is that I have got two buildings (the workshop and War smith) which I cannot build. The 'builder' unit that I have got registers them in their build tree and I can see the icons in the build menu when I'm in custom campaign in TFT, but they are greyed out and a weird requirement. The message that I get when hovering over the images is: "Kashira's hut" (my custom Town Hall) and below that is "Default String".

What does this mean? Have I missed something important when changing these buildings? And how can I fix the problem?

I will appreciate any advice you can give.

 

[Adiktuz]

it means the building has that Hut on their Techtree requirements... and maybe you deleted some strings which why it shows default string...

 

[MoreCat]

i meet the same problem,how can I fix the problem?

ANSWER: The solution was to give it a random requirement. You don't need to research the requirement. It's checking for a building.