class MySurvey(BaseSurvey):
   def generate_observations_rough(self, conditions):
       obs = empty_observation()
       obs['RA'] = np.radians(273.0)
       obs['dec'] = np.radians(-78.0)
       #obs['RA'] = 0
       #obs['dec'] = np.radians(-87)
       obs['exptime'] = 30.  # Seconds
       obs['nexp'] = 2
       obs['filter'] = 'r'
       # If it's been 12 hours or more, don't try to execute the observation anymore
       obs['flush_by_mjd'] = conditions.mjd + 1
       obs['note'] = 'mysurvey'  # Always good to set the note to which survey generated the observation
       # Make it a list of n
       result = [obs] * 7
       return result
       #print(empty_observation)

# Now to build our scheduler object, and run it for a day
scheduler = CoreScheduler([my_survey], nside=nside)
# sim_runner will return the updated model observatory, the updated scheduler, and an array of
# completed observations
mo, scheduler, observations = sim_runner(mo, scheduler,survey_length=1,
                                                verbose=True)

RuntimeError                              Traceback (most recent call last)
[scheduler.ipynb](about:blank) Cell 10 line 7
      2 scheduler = CoreScheduler([my_survey], nside=nside)
      3 # sim_runner will return the updated model observatory, the updated scheduler, and an array of
      4 # completed observations
----> 7 mo, scheduler, observations = sim_runner(mo, scheduler,survey_length=1,
      8                                                  verbose=True)

File[ ~/.conda/envs/rubin-sim/lib/python3.11/site-packages/rubin_sim/scheduler/sim_runner.py:105](about:blank), in sim_runner(observatory, scheduler, filter_scheduler, mjd_start, survey_length, filename, delete_past, n_visit_limit, step_none, verbose, extra_info, event_table, record_rewards)
    102 if observatory.mjd == mjd_last_flush:
    103     #sush
    104     print(mjd_last_flush)
-->[ 105](about:blank)     raise RuntimeError("Scheduler has failed to provide a valid observation multiple times.")
    106 # if this is a first offence, might just be that targets set. Flush queue and get some new targets.
    107 scheduler.flush_queue()

RuntimeError: Scheduler has failed to provide a valid observation multiple times