It's mighty good that Netflix has brought out a set of remedies specific to Error Code NW-1-19, and the information relates to which equipment you're having the issue with. You can read through the material here.
Can you confirm how you're accessing Netflix? Is it from a tablet, a PC, your TV box , or other device? If you're accessing Netflix from your TV box, can I know which type TV box you have?
As the error code points to an internet connectivity issue, you can try rebooting your device.
Let me know how it goes so that I can help further.