[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type '() => Null' is not a subtype of type '(void) => dynamic' of 'f'

 

that is very interesting error, 

 _verificationCodeController.text =
                        _formData['email_verification_code'] ;
for the formData['email_verification_code'] is Null