Thank you both! There should be no running uplink instances at the moment.
I’ve also tried changing the name of the callable, and it did not help. What is really strange, however, is that when I ran the following, I got the same error even though there’s no function defined with that name:
import anvil.server
import anvil.users
import pandas as pd
anvil.server.connect("...")
anvil.users.login_with_email("...", "...")
data = anvil.server.call('aaa')
print(data)