Most common reasons:
1. The shape family isn't supported yet. See the list above. If you typed "crown moulding" or "saddle" we don't have a recipe.
2. You used imperial. Everything is millimetres. "8 inches" → won't parse. Convert to mm first.
3. Typo in a NACA code. NACA codes are exactly 4 digits — `NACA2412`, not `NACA 2412` (a space is OK) or `NACA241` (3 digits).
4. Missing keywords. The parser looks for words like `chord`, `span`, `diameter`, `length`, `height` to figure out which number is which. If you type `NACA2412 200 600` we don't know which is chord and which is span. Add the keyword.
When it misses, the error message lists examples that DO work — copy one and adapt.
1. The shape family isn't supported yet. See the list above. If you typed "crown moulding" or "saddle" we don't have a recipe.
2. You used imperial. Everything is millimetres. "8 inches" → won't parse. Convert to mm first.
3. Typo in a NACA code. NACA codes are exactly 4 digits — `NACA2412`, not `NACA 2412` (a space is OK) or `NACA241` (3 digits).
4. Missing keywords. The parser looks for words like `chord`, `span`, `diameter`, `length`, `height` to figure out which number is which. If you type `NACA2412 200 600` we don't know which is chord and which is span. Add the keyword.
When it misses, the error message lists examples that DO work — copy one and adapt.