Arduinos not found. Quitting.

[KulaGGin]

I wanted to test how much latency I will get over the USB. After I flash Arduino Leonardo with ArduinoTimingTest.ino sketch and start ArduinoCommSpeedTest.exe on Windows, it shows this error:

Arduino is fully functioning, present and Arduino IDE can see it:

Here's a video demonstration how I compile and launch it:
https://www.youtube.com/watch?v=nqCw39VsVbc

Any advices on how I can fix this?

[KulaGGin]

Apparently, I was flashing wrong Arduino sketch - ArduinoTimingTest.ino. When I flash ArduinoTask.ino and start ArduinoCommSpeedTest.exe, it does see Arduinos but then I get the "Failure to connect to Port Quitting" error:

Just as the guy in Issue #2. Can you please look into it?

I don't use any kind of RS232 shields or PCIe cards, I just connect Arduino to a USB port on the motherboard.