HakunaMatata | Project for creating 3D mesh using Kinect Sensor | Robotics library

According to your error, it is reporting ZZZ and USD as invalid countries. This leads to the suspicion you are somehow passing USD as a country (either convert_from or convert_to). You should actually check you are entering the right value in one of those fields.

Also, I would rename the field value since value has a specific meaning in HTML and Forms (maybe call it amt_to_convert). Who knows, it might be interfering with your code

Also, you will definitely get an error for the amount because you are checking that it is a float value but your form will pass it as a string to Flask and you didn't convert the value immediately to float (you only convert the value while it is being passed to your convert function; you are not converting your stored variable).

Change your code to value = float(request.form.get('value'))

Explanation: You raise an error when value is not float, so you should convert the value from your form to float