ElementNotVisibleException: Message: element not visible

from urllib import parse
from selenium import webdriver
from selenium.webdriver.support.ui import Select
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.keys import Keys

class ICAIScraper(object):
    def __init__(self):
        self.url = "https://www.icaionlineregistration.org/Admin_Module/Login.aspx"
        self.driver = webdriver.Chrome('C:\chromedriver.exe')

    def scrape(self):
        self.driver.get(self.url)
        wait = WebDriverWait(self.driver, 10)
        wait.until(lambda driver: driver.find_element_by_id('txt_username').is_displayed() == False)
        print('Yay! on the first page')
        username = self.driver.find_element_by_id('txt_username')
        username.click()
        username.send_keys('username')
        password = self.driver.find_element_by_id('txt_password')
        password.send_keys('password')
        password.send_keys(Keys.ENTER)
        self.driver.quit()

if __name__ == '__main__':
   scraper = ICAIScraper()
   scraper.scrape()