This error may show in the ScanSnap software if the program cannot access the scanner. First, try the steps from the connect error.
If that does not work, try connecting the scanner directly to a (different) USB port on the computer. Don’t use a USB hub or a WiFi connection. Also, test the USB cable if you suspect it may be faulty.
If you are using the ScanSnap Manager software, you can run the ScanSnap support tool to check the access privileges for the scanner device. Start the support tool from the Start menu in the ScanSnap Manager group. In the support tool, select the Recover tab (1) and then click the Check button (2).
After this, click the Recover button to find out if the problem has been resolved.