error: expected string or bytes-like object

I have tested on the site, the image will only be load when you scroll to the position. So what you need to do is to combine scroll function for the task. You can achieve by something like the following:

for i in range(1,61):

try:

# The Images loaded

image = driver.find_element_by_xpath(the_string)

urllib.request.urlretrieve(image.get_attribute("src"), path)

except:

# Image not yet load

driver.execute_script("window.scrollTo(0, some_number)")

image = driver.find_element_by_xpath(the_string)

urllib.request.urlretrieve(image.get_attribute("src"), path)