<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def register(context, request, load):
 """Validate the username and password and create the user."""

    data = request.json
    res = validate(data, dataclass_to_jsl(
        RegistrationSchema).get_schema())
    if res:
        @request.after
        def set_error(response):
            response.status = 422
        return {
            'status': 'error',
            'field_errors': [{'message': res[x]} for x in res.keys()]
        }

    if data['password'] != data['password_validate']:
        @request.after
        def adjust_response(response):
            response.status = 422

        return {'status': 'error',
                'message': 'Password confirmation does not match'}

    if 'state' not in data.keys() or not data['state']:
        data['state'] = request.app.settings.application.new_user_state
    del data['password_validate']
    obj = context.create(data)
    return {'status': 'success'}