This is a fairly common issue that pops up in the IT inbox at least once a week from somewhere in our network. Essentially what it means is a specific software service that runs the process that operates the vein scanner is currently not running.
There is two ways to fix this.
1. Reboot the computer. (The go to for all IT problems). 99% of the time when you reboot the computer, this service will be back up and running again.
2. Click the start button > and type "SERVICES' until a little icon with two silver cogs appears. Click it. A new window will appear, which displays all the services currently on the computer. Scroll down until you see TimeTarget.LocalService and click the name, and in the top left corner, click Start the Service.
This will take a second, but after which if you refresh the https://redspot.humanforce.com link the page should operate correctly.
Hope that helps.