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Flutter - TextFormField Crash App When Want to Change Initial Value

I want to change my initial value from text form field... when i try to edit my initial value my application gone crash my TextFormField Code~:

TextField(
                          controller: emailController..text = email,
                        ),

my Email COntroller~:

  TextEditingController emailController = TextEditingController();
question from:https://stackoverflow.com/questions/65559641/flutter-textformfield-crash-app-when-want-to-change-initial-value

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 emailController.value = TextEditingValue(
      text: email,
      selection: TextSelection.fromPosition(
        TextPosition(offset: email.length),
      ),
    );

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