I got an email (copy-pasted below) from Cron for tool urbanecmbot on May 3 at 02:00.
Traceback (most recent call last):
File "/usr/bin/job", line 21, in <module>
import xml.etree.ElementTree
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 669, in exec_module
File "<frozen importlib._bootstrap_external>", line 773, in get_code
File "<frozen importlib._bootstrap_external>", line 484, in _compile_bytecode
MemoryErrorIt looks it's impossible to submit a job at some point.