Shiprush won't open...shiprush server: (Scale Engine)

Can't open shiprush. Get the following and I have never used scale in the past.

Unable to Connect to Shiprush Server: (Scale Engine) Scale "Stamps.com USB Scale (Stamps.com Stainless Steel 5 lb Digital Scale)" is not available. CHeck that the scale is plugged in to the PC. IF the problem persists please reboot the PC.