An exception was thrown from the Python worker. Please see the stack trace below.
Traceback (most recent call last):
  File "/usr/local/lib64/python3.7/site-packages/pendulum/parsing/__init__.py", line 132, in _parse
    text, dayfirst=options["day_first"], yearfirst=options["year_first"]
  File "/usr/local/lib/python3.7/site-packages/dateutil/parser/_parser.py", line 1368, in parse
    return DEFAULTPARSER.parse(timestr, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/dateutil/parser/_parser.py", line 643, in parse
    raise ParserError("Unknown string format: %s", timestr)
dateutil.parser._parser.ParserError: Unknown string format: None

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/worker.py", line 604, in main
    process()
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/worker.py", line 596, in process
    serializer.dump_stream(out_iter, outfile)
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/serializers.py", line 211, in dump_stream
    self.serializer.dump_stream(self._batched(iterator), stream)
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/serializers.py", line 132, in dump_stream
    for obj in iterator:
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/serializers.py", line 200, in _batched
    for item in iterator:
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/worker.py", line 450, in mapper
    result = tuple(f(*[a[o] for o in arg_offsets]) for (arg_offsets, f) in udfs)
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/worker.py", line 450, in <genexpr>
    result = tuple(f(*[a[o] for o in arg_offsets]) for (arg_offsets, f) in udfs)
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/worker.py", line 83, in <lambda>
    return lambda *a: toInternal(f(*a))
  File "/mnt/yarn/usercache/livy/appcache/application_1639628500827_0063/container_1639628500827_0063_01_000068/pyspark.zip/pyspark/util.py", line 87, in wrapper
    return f(*args, **kwargs)
  File "<string>", line 71, in udf_to_utc_timezone
  File "/usr/local/lib64/python3.7/site-packages/pendulum/parser.py", line 29, in parse
    return _parse(text, **options)
  File "/usr/local/lib64/python3.7/site-packages/pendulum/parser.py", line 45, in _parse
    parsed = base_parse(text, **options)
  File "/usr/local/lib64/python3.7/site-packages/pendulum/parsing/__init__.py", line 74, in parse
    return _normalize(_parse(text, **_options), **_options)
  File "/usr/local/lib64/python3.7/site-packages/pendulum/parsing/__init__.py", line 135, in _parse
    raise ParserError("Invalid date string: {}".format(text))
pendulum.parsing.exceptions.ParserError: Invalid date string: None