It may be hard to say if this is a bug or error. Can you attach the file to check.
Also if you remove the relation from that line (removed the on edge relation) then what happens.
sorry, probably I can't post the file.. but I can tell you that:
- If I remove the "on edge" relation ( coming from the "convert entities command") the error disappears
- seams like the problem is related to an arc of circle with the center located along a reference geometry: axis (the blue vertical line)
- actually the problem is not related to the "convert entities" command... to make the error appear is just enough create a line with an edge coincident to that arc circle center and then make the line vertical (if I make it horizontal the problem doesn't appear! ... :/ ). Here the figures:
to me seams like it's a real solidworks bug ..
If you can't post the file then please re[port the issue to your VAR (from where you bought the SOLIDWORKS)