The message "Error authenticating" usually appears if the entered password is incorrect.
Restart the Frame
To make sure that the frame the best possible conditions for connecting to your Wi-Fi after an error message, please restart the frame.
Show Password While Typing
To ensure that the frame registers the characters correctly while typing the password, you can press the 
icon next to the password field.
This will make the password visible while typing and allows you to double check that the password is entered correctly.
Double Check Password
It can be hard to remember WiFi passwords since they often consist of random words, letters and numbers.
If you are not entirely sure if the password you are trying to enter is correct, please get in contact with your Internet Service Provider and ask for their assistance.