Renderfield error

[shadow delta]

Hello everyone.. In the tutorial for Healthcare application at timestamp 41:40
Line #53 the <RenderField> is displaying red swiggly line . A snapshot is attached displaying the error message ..kindly help me to solve this error. I would be highly thankful

[crude kiln]

it should not affect your application

even i have the error

[shadow delta]

So should i carry on with the process?

The text area field gets missing in my application whereas in the video it appears