How to add custom profile to weldments?

1. I opened SW-12 and sketched the desired profile there.
2. i Saved it as Library feature file in Weldment profile folder as 'round1'
3. Then I opened SW, Went to weldment profiles in the weldement workbench.
4. The option 'round1' was visible in the options and I selected it
5. But when I clicked on the drawing to apply weldment, there was an error -" this library part feature is empty"