No error messages?

If I enter wrong data in the Contact form (based on the Classic Contact Form), I get no error message. Nor do I see what field has wrong input. How can I change this, so that users see why their contact form isn’t sending and what they need to change? I tested this with both Safari and Chrome for Max (OS X El Capitan). you can view the form here: https://www.melati-communicatie.nl/

• This topic was modified 8 years, 5 months ago by kjvos.
• This topic was modified 8 years, 5 months ago by kjvos.