Hi Emma,
There is a failure connection beween WiFi module and the board where is connected (ESS). Power off the machine, remove and reinstall the WiFi module, power on the macine and if this not work it could be an issue with WiFi module.
If your machine have both, WiFi and wired connection you must chose one of them. The machine can work just with one connection: Network or WiFi, not both.
Gabi