I've been creating quite a few custom symbols, and occasionally when I export the symbol as a .s01 file, I get the "Parameter is not valid" error message I pasted below.  The .s01 file is created, but it appears in the Symbol Browser as a red X (the 2nd image I pasted below).  If you would like me to send the original .s07 file via email, please let me know.  Thanks.

Yes, please email the .S07 file along with exact steps to reproduce the effect to techsupport@stardraw.com 

Kind regards,
Rob Robinson
Stardraw.com

For those following the thread, the problem was caused by a bad user symbol that contained invalid data - Arcs with zero height and width.

The update to Stardraw Design 7.4 published August 15th 2025 includes a fix to cater for this scenario.


Kind regards,
Rob Robinson
Stardraw.com