# Unable to Start CFD or Meshing Jobs — Repeated Unexpected Errors

**URL:** <https://www.simscale.com/forum/t/unable-to-start-cfd-or-meshing-jobs-repeated-unexpected-errors/101401>\
**Category:** Project Support\
**Created:** [October 22, 2026, 12:29pm UTC](https://www.simscale.com/forum/t/unable-to-start-cfd-or-meshing-jobs-repeated-unexpected-errors/101401 "2026-10-22T12:29:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![camy25](https://www.simscale.com/forum/letter_avatar/camy25/32/5_5575768a8748004e209b776fc1b2916d.png) [@camy25](https://www.simscale.com/forum/u/camy25)\
**Post date:** [October 22, 2026, 12:29pm UTC](https://www.simscale.com/forum/t/unable-to-start-cfd-or-meshing-jobs-repeated-unexpected-errors/101401/1 "2026-10-22T12:29:58Z")

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Hello,

I am experiencing repeated job-launch failures in my academic SimScale project,

An earlier conjugate heat transfer simulation completed successfully using a conformal multi-region mesh containing approximately 3.26 million cells.

I subsequently duplicated the simulation to correct a heat-flux boundary-condition face assignment. However, the new simulation repeatedly failed to create or start a computational job.

I attempted to generate a new mesh using the same settings, but the meshing job also failed to start.

To isolate the issue, I created another simulation directly from the previously successful configuration. This simulation also failed to launch.

The reported error codes are:

- `WvuOn36M` — Initial run-creation failure

- `c0DizYF9` —initial run creation/job-start failure

- `3F9CPZVm` — initial run mesh-generation failure

- `YYj052GU` — duplicate run (replaced assigned face)-creation/job-start failure

All errors display a generic unexpected-error message without identifying the underlying cause.

Could these failures be related to my project configuration (I only reassigned one face), mesh references, or SimScale’s job scheduler?

Thank you …