[AI_resaerch.txt] strange error msg

[trooper]

after adding the folowing lines in the AI_research file of my race :

AI State := Exploration, Infrastructure, Prepare for Attack, Attack, Secure Holdings After Attack, Incursion, Prepare for Defense, Defend (Short Term), Defend (Long Term)
Tech Area Name := Gas Giant Colonization
Tech Area Level := 1
Tech Area Min Percent := 25

I've got the folowing message :

Unknown value "Gaz Giant Colonization" for Tech Area Name in record "Gaz Giant Colonization".

???