Hi @DannyTran,
A warm welcome here in the Roku Community!
We have noticed that you are receiving error code 11819 when attempting to cast on your Roku device. We appreciate the additional details provided. This issue suggests that the information stored on your device may need to be refreshed, as recommended by Netflix support. We kindly suggest trying the troubleshooting steps provided by them to see if the issue can be resolved here: Netflix Error -11819
As a workaround, you can also check this support article on how to cast apps like YouTube or Netflix from your phone to a TV.
Let us know if this helps!
Thanks,
Rey
ERey.
Roku Community Moderator