Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "pandas/_libs/tslibs/timedeltas.pyx", line 1020, in pandas._libs.tslibs.timedeltas.Timedelta.__new__


 "pandas/_libs/tslibs/timedeltas.pyx", line 136, in pandas._libs.tslibs.timedeltas.convert_to_timedelta64


 "pandas/_libs/tslibs/timedeltas.pyx", line 225, in pandas._libs.tslibs.timedeltas.cast_from_unit
ValueError: cannot cast unit ps

Traceback (most recent call last):


 "/usr/local/lib/python3.6/site-packages/superset/utils/core.py", line 624, in __enter__

signal.signal(signal.SIGALRM, self.handle_timeout)


 "/usr/local/lib/python3.6/signal.py", line 47, in signal

handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread
