This typically means the STBTrace driver didn’t properly get installed on your system.
The STBTrace driver, which handles some of the basic IO operations, can be installed via the executable InstallSTBTrace_V840.exe, which is included in the STB folder
Install the InstallSTBTrace_v840.exe and verify the status of the driver:
Typically this driver will fail to install if STB was installed without being logged into the test system Locally and as Administrator.