# Index out of range error **URL:** \ **Category:** Cylc Support\ **Created:** [November 28, 2024, 12:22am UTC](https://cylc.discourse.group/t/index-out-of-range-error/1070 "2024-11-28T00:22:26Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![TomC](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/tomc/32/115_2.png) [@TomC](https://cylc.discourse.group/u/TomC)\ **Post date:** [November 28, 2024, 12:22am UTC](https://cylc.discourse.group/t/index-out-of-range-error/1070/1 "2024-11-28T00:22:26Z")
I saw this error in a log this morning. ```auto 2024-11-27T03:56:15Z INFO - [20241127T0200Z/finish_getobs:succeeded] already finished and completed (flows=1)) 2024-11-27T03:56:17Z INFO - [20241126T1200Z/bn_um_recon_ls_cov_6/01:submitted] (polled)started 2024-11-27T03:56:17Z INFO - [20241126T1200Z/bn_um_recon_ls_cov_6/01:submitted] setting implied output: submitted 2024-11-27T03:56:17Z INFO - [20241126T1200Z/bn_um_recon_ls_cov_6/01:submitted] submitted to platform:None[None] 2024-11-27T03:56:17Z WARNING - Unhandled jobs-poll output: 2024-11-27T03:56:16Z|20241126T1200Z/bn_um_recon_ls_cov_6/01|{"job_runner_name": "pbs", "job_id": "4185188", "job_runner_exit_polled": 0, "time_submit_exit": "2024-11-27T03:53:42Z", "time_run": "2024-11-27T03:55:48Z"} 2024-11-27T03:56:17Z WARNING - list index out of range 2024-11-27T03:56:37Z INFO - [20241126T1400Z/bn_um_fcst_14/01:submitted] (polled)started 2024-11-27T03:56:37Z INFO - [20241126T1400Z/bn_um_fcst_14/01:submitted] setting implied output: submitted 2024-11-27T03:56:37Z INFO - [20241126T1400Z/bn_um_fcst_14/01:submitted] submitted to another-platform:None[None] 2024-11-27T03:56:37Z WARNING - Unhandled jobs-poll output: 2024-11-27T03:56:37Z|20241126T1400Z/bn_um_fcst_14/01|{"job_runner_name": "pbs", "job_id": "4185508", "job_runner_exit_polled": 0, "time_submit_exit": "2024-11-27T03:55:34Z", "time_run": "2024-11-27T03:55:43Z"} 2024-11-27T03:56:37Z WARNING - list index out of range 2024-11-27T03:57:20Z INFO - platform: my-platfrm - remote file install (on remote-host) 2024-11-27T03:57:24Z INFO - platform: my-platfrm - remote file install complete 2024-11-27T03:57:32Z INFO - [20241126T1400Z/bn_backup_var_anl/01:submitted] setting implied output: submitted 2024-11-27T03:57:32Z INFO - [20241126T1400Z/bn_backup_var_anl/01:submitted] submitted to my-platfrm:None[None] 2024-11-27T03:57:32Z CRITICAL - An uncaught error caused Cylc to shut down. If you think this was an issue in Cylc, please report the following traceback to the developers. https://github.com/cylc/cylc-flow/issues/new?assignees=&labels=bug&template=bug.md&title=; 2024-11-27T03:57:32Z ERROR - list index out of range Traceback (most recent call last): File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/scheduler_cli.py", line 689, in cylc_play asyncio.get_running_loop() RuntimeError: no running event loop During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/scheduler.py", line 652, in run_scheduler await self._main_loop() File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/scheduler.py", line 1537, in _main_loop self.process_queued_task_messages() File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/scheduler.py", line 907, in process_queued_task_messages if self.task_events_mgr.process_message( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/task_events_mgr.py", line 716, in process_message self.process_message( File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/task_events_mgr.py", line 770, in process_message self._process_message_submitted(itask, event_time, forced) File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/task_events_mgr.py", line 1497, in _process_message_submitted self._insert_task_job( File "/homeminiconda3/cylc-8.3.5/lib/python3.11/site-packages/cylc/flow/task_events_mgr.py", line 1541, in _insert_task_job job_conf = itask.jobs[-1] ~~~~~~~~~~ ^^^^ IndexError: list index out of range 2024-11-27T03:57:32Z CRITICAL - Workflow shutting down - list index out of range 2024-11-27T03:57:32Z WARNING - Orphaned tasks: * 20241126T1200Z/bn_backup_um_fcst (running) * 20241126T1200Z/bn_um_recon_ls_cov_6 (submitted) * 20241126T1400Z/bn_um_fcst_14 (submitted) * 20241126T1400Z/bn_set_varbc (submitted) * 20241126T1400Z/bn_backup_var_anl (submitted) ``` Is this something we did or a bug somewhere in Cylc? ---
**Author:** ![hilary.j.oliver](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/hilary.j.oliver/32/4_2.png) [@hilary.j.oliver](https://cylc.discourse.group/u/hilary.j.oliver)\ **Post date:** [November 28, 2024, 1:29am UTC](https://cylc.discourse.group/t/index-out-of-range-error/1070/2 "2024-11-28T01:29:33Z")
It may be have been triggered by something unusual you did, but it’s a bug regardless - can you post an issue on the cylc-flow repo please, along with steps to reproduce if possible. ---
**Author:** ![TomC](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/tomc/32/115_2.png) [@TomC](https://cylc.discourse.group/u/TomC)\ **Post date:** [November 28, 2024, 2:23am UTC](https://cylc.discourse.group/t/index-out-of-range-error/1070/3 "2024-11-28T02:23:50Z")
Ok, posted an Issue at [Workflow disappeared - `list index out of range` error · Issue #6500 · cylc/cylc-flow · GitHub](https://github.com/cylc/cylc-flow/issues/6500) - best guess from me is a fail in the callback functions. ---
**Author:** ![oliver.sanders](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/oliver.sanders/32/110_2.png) [@oliver.sanders](https://cylc.discourse.group/u/oliver.sanders)\ **Post date:** [November 28, 2024, 9:35am UTC](https://cylc.discourse.group/t/index-out-of-range-error/1070/4 "2024-11-28T09:35:02Z")
I think this issue has already been fixed in Cylc 8.3.6.