When using the camera search functionality, SWVMS16 may crash. The issue is caused when non-camera UPnP devices on the network send out large packet sizes. Upcoming video monitoring releases will fix this issue.
Workaround: If the issue occurs, add your cameras manually to the SWVMS16.
SWVMS16 v1.21 Release Notes posted online.
Attached file shows the error message and the steps to manually add cameras to the SWVMS16.