How to reset the error state of a TextField in Flutter? - flutter

Question

I have a flutter TextField which is not embedded in a Form. I want to show and hide an error message, and also have the TextField move in and out of an error state.
When I set the errorMessage property on the TextField it correctly shows the error message and the TextField is given a redline under it to show it's in an error state.
But when I set the error message to null, the error message disappears as expected, but the TextField continues to show a red line under it.
How do I reset the error state of the TextField so it doesn't show the red line under it?
Here is my code.
class _EmailTextFieldState extends State<EmailTextField> {
static const borderColor = Color.fromARGB(255, 84, 160, 246);
#override
Widget build(BuildContext context) {
return BlocBuilder<CustomLoginScreenBloc, CustomLoginScreenState>(
builder: (context, state) {
return Padding(
padding: const EdgeInsets.fromLTRB(30, 30, 30, 20),
child: TextField(
onChanged: (text) {
context
.read<CustomLoginScreenBloc>()
.add(EmailTextChanged(email: text));
},
style: const TextStyle(fontSize: 14),
obscureText: false,
decoration: InputDecoration(
// icon: Icon(Icons.email_outlined),
prefixIcon: const Icon(Icons.email_outlined),
filled: true,
fillColor: const Color.fromRGBO(238, 244, 251, 1),
errorText: state.validationErrorMessage,
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(8.0)),
borderSide: BorderSide(
color: borderColor, width: 0.1, style: BorderStyle.solid),
),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(8.0)),
borderSide: BorderSide(
color: borderColor, width: 0.5, style: BorderStyle.solid),
),
errorBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(8.0)),
borderSide: BorderSide(
color: borderColor, width: 0.1, style: BorderStyle.solid),
),
disabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(8.0)),
borderSide: BorderSide(
color: borderColor, width: 0.1, style: BorderStyle.solid),
),
labelText: 'email'),
),
);
});
}
}