Could not connect to the Wi-Fi network because the Wi-Fi password is not correctly set on the PS4, or the wireless network is busy.
Go to [Settings] > [Network] > [Set up Internet Connection] to configure the network settings again.
If the error only occurs in a limited period of time, the wireless network may be busy and preventing the connection. Try disconnecting other devices from the wireless network and retry internet connection test at [Settings] > [Network] > [Test Internet Connection]. If you cannot disconnect other devices from the wireless network, try the internet connection test on PS4 later.