```ruby
class UserAccountValidation
  
  # success message
  ACCOUNT_VERIFICATION_COMPLETE = {
    "status" => "Registration Complete!",
    "message" => "An administrator will email you when your account is ready."
  }
  
  INVALID_VERIFICATION_CODE = {
    "status" => "Account validation failed!",
    "message" => "Invalid account verification code."
  }
  
  # error condition for attempt to re-verify verified account
  ACCOUNT_PREVIOUSLY_VERIFIED = {
    "status" => "Account validation failed!",
    "message" => "This account was previously verified. For questions please contact #{APP_CONFIG['support_email']}"
  }
  
  # error condition for unhandled exceptions
  UNEXPECTED_VERIFICATION_ERROR = {
    "status" => "Account validation failed!",
    "message" => "Unexpected verification error. Try again later."
  }
    
  def self.validate_account(emailToken)
    begin
      ApplicationHelper.verify_email(emailToken)
      return ACCOUNT_VERIFICATION_COMPLETE
    rescue => e
      Rails.logger.error "VERIFICATION ERROR:   #{e}"
      # TODO have approval engine raise exceptions or check approval state instead of matching msg strings
      if e.to_s == "Current status 'approved' does not allow transition 'verify_email'."
        return ACCOUNT_PREVIOUSLY_VERIFIED
      elsif e.to_s == "Could not find user for email id #{emailToken}."
        return INVALID_VERIFICATION_CODE
      else
        return UNEXPECTED_VERIFICATION_ERROR
      end
    end
  end
end
```

Fix error message for duplicate email validation attempts
user
```ruby
class UserAccountValidation
  
  # success message
  ACCOUNT_VERIFICATION_COMPLETE = {
    "status" => "Registration Complete!",
    "message" => "An administrator will email you when your account is ready."
  }
  
  INVALID_VERIFICATION_CODE = {
    "status" => "Account validation failed!",
    "message" => "Invalid account verification code."
  }
  
  # error condition for attempt to re-verify verified account
  ACCOUNT_PREVIOUSLY_VERIFIED = {
    "status" => "Account validation failed!",
    "message" => "This account was previously verified. For questions please contact #{APP_CONFIG['support_email']}"
  }
  
  # error condition for unhandled exceptions
  UNEXPECTED_VERIFICATION_ERROR = {
    "status" => "Account validation failed!",
    "message" => "Unexpected verification error. Try again later."
  }
    
  def self.validate_account(emailToken)
    begin
      ApplicationHelper.verify_email(emailToken)
      return ACCOUNT_VERIFICATION_COMPLETE
    rescue => e
      Rails.logger.error "VERIFICATION ERROR:   #{e}"
      # TODO have approval engine raise exceptions or check approval state instead of matching msg strings
      if e.to_s =~ /^Current status '\w+' does not allow transition 'verify_email'\.$/
        return ACCOUNT_PREVIOUSLY_VERIFIED
      elsif e.to_s == "Could not find user for email id #{emailToken}."
        return INVALID_VERIFICATION_CODE
      else
        return UNEXPECTED_VERIFICATION_ERROR
      end
    end
  end
end
```
assistant