How can I setup custom required field validation message for a text field in my custom form. I tried below code. But it is not working. It always showing ‘Please fill out this field’.
$form['first_name'] = [ '#type' => 'textfield', '#title' => $this->t('First Name'), '#default_value' => $this->store->get('first_name') ? $this->store->get('first_name') : '', '#required_but_empty' => $this->t('Please enter First Name'), '#required' => TRUE, ]; 
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