In this instance you have not successfully connected a controller to your operating system.
Usually this is one of the following:
- Faulty USB cable
- Incorrect process for connecting the transmitter as a game controller and the transmitter is instead connected as a mass storage device
- Faulty USB port on the transmitter
For windows:
https://batcavegames.freshdesk.com/a/solutions/articles/16000099501
For linux please check the linux section as there are multiple issues that can affect linux joysticks ...
https://batcavegames.freshdesk.com/a/solutions/articles/16000103814
https://batcavegames.freshdesk.com/a/solutions/articles/16000121276