Need help creating a new building

Hello

Does anyone know how you can create a new building? I tried it but I had no success. Here's what I did:

export_descr_buildings.txt;
building hospitals
{
levels hospital
{
hospital requires factions { greek, roman, }
{
capability
{
population_health_bonus bonus 3
}
construction 1
cost 1600
settlement_min city
upgrades
{
}
}
}
plugins
{
}
}

export_descr_buildings_enums.txt;
hospital
hospital_desc
hospital_desc_short
hospital_barbarian_desc
hospital_barbarian_desc_short
hospital_carthage_desc
hospital_carthage_desc_short
hospital_eastern_desc
hospital_eastern_desc_short
hospital_parthia_desc
hospital_parthia_desc_short
hospital_egyptian_desc
hospital_egyptian_desc_short
hospital_greek_desc
hospital_greek_desc_short
hospital_roman_desc
hospital_roman_desc_short

text\export_buildings.txt;
{hospital} err

{hospital_desc} err

{hospital_desc_short} err

{hospital_barbarian_desc}
err

{hospital_barbarian_desc_short}
err

{hospital_carthage_desc}
err

{hospital_carthage_desc_short}
err

{hospital_eastern_desc}
err

{hospital_eastern_desc_short}
err

{hospital_parthia_desc}
err

{hospital_parthia_desc_short}
err

{hospital_egyptian_desc}
err

{hospital_egyptian_desc_short}
err

{hospital_greek_desc}
A hospital

{hospital_greek_desc_short}
A hospital

{hospital_roman_desc}
A hospital

{hospital_roman_desc_short}
A hospital

When I tried to start my game it crashed to desktop without any error.

After looking in export_buildings.txt I found out that I had to add the following:
{hospitals_name}
Hospitals - improve city health

Now I can build them in my game, I just need to make a couple of images