# lsst.pex.config.config.FieldValidationError in tutorial

**URL:** <https://www.rubin.community/t/lsst-pex-config-config-fieldvalidationerror-in-tutorial/3702>\
**Category:** Support\
**Created:** [May 14, 2019, 10:03am UTC](https://www.rubin.community/t/lsst-pex-config-config-fieldvalidationerror-in-tutorial/3702 "2019-05-14T10:03:09Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Brnikat](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/brnikat/32/866_2.png) [@Brnikat](https://www.rubin.community/u/Brnikat)\
**Post date:** [May 14, 2019, 10:03am UTC](https://www.rubin.community/t/lsst-pex-config-config-fieldvalidationerror-in-tutorial/3702/1 "2019-05-14T10:03:09Z")

</div>

The tutorial works well until the command `forcedPhotCoadd.py DATA --rerun coaddPhot:coaddForcedPhot --id filter=HSC-R` and then fails with

```auto
root INFO: Loading config overrride file '/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/obs_subaru/17.0.1/config/forcedPhotCoadd.py'
Cannot import lsst.meas.extensions.photometryKron: disabling Kron measurements
Cannot import lsst.meas.extensions.convolved (No module named 'lsst.meas.extensions.convolved'): disabling convolved flux measurements
Traceback (most recent call last):
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/configChoiceField.py", line 246, in __getitem__
    value = self._dict[k]
KeyError: 'ext_convolved_ConvolvedFlux'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/configChoiceField.py", line 249, in __getitem__
    dtype = self._field.typemap[k]
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/registry.py", line 208, in __getitem__
    return self.registry[k].ConfigClass
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/registry.py", line 159, in __getitem__
    return self._dict[key]
KeyError: 'ext_convolved_ConvolvedFlux'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/meas_base/17.0.1/bin/forcedPhotCoadd.py", line 24, in <module>
    ForcedPhotCoaddTask.parseAndRun()
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pipe_base/17.0.1/python/lsst/pipe/base/cmdLineTask.py", line 598, in parseAndRun
    parsedCmd = argumentParser.parse_args(config=config, args=args, log=log, override=cls.applyOverrides)
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pipe_base/17.0.1/python/lsst/pipe/base/argumentParser.py", line 639, in parse_args
    self._applyInitialOverrides(namespace)
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pipe_base/17.0.1/python/lsst/pipe/base/argumentParser.py", line 837, in _applyInitialOverrides
    namespace.config.load(filePath)
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/config.py", line 938, in load
    self.loadFromStream(stream=code, root=root)
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/config.py", line 976, in loadFromStream
    exec(stream, {}, local)
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/obs_subaru/17.0.1/config/forcedPhotCoadd.py", line 44, in <module>
    config.measurement.plugins["ext_convolved_ConvolvedFlux"].getAllResultNames())
  File "/usr/local/src/lsst_stack/stack/miniconda3-4.5.4-fcd27eb/Linux64/pex_config/17.0.1/python/lsst/pex/config/configChoiceField.py", line 252, in __getitem__
    "Unknown key %r in Registry/ConfigChoiceField" % k)
lsst.pex.config.config.FieldValidationError: RegistryField 'measurement.plugins' failed validation: Unknown key 'ext_convolved_ConvolvedFlux' in Registry/ConfigChoiceField
For more information read the Field definition at:
  File pex/config/registry.py:316 ( __init__ )And the Config definition at:
  File meas/base/forcedMeasurement.py:169 (<module>)

```

Not sure what to do about this one. It appears similar but not identical to a couple of bug reports back in Jul 18 but they’ve been fixed.

(Added in edit: needed to ‘setup meas\_extensions\_convolved’. Perhaps this could be added to the tutorial instructions.

---

<div class="post-metadata">

**Author:** ![price](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/price/32/488_2.png) [@price](https://www.rubin.community/u/price)\
**Post date:** [May 14, 2019, 1:05pm UTC](https://www.rubin.community/t/lsst-pex-config-config-fieldvalidationerror-in-tutorial/3702/2 "2019-05-14T13:05:22Z")

</div>

Are you not doing `setup lsst_distrib`?

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<div class="post-metadata">

**Author:** ![Brnikat](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/brnikat/32/866_2.png) [@Brnikat](https://www.rubin.community/u/Brnikat)\
**Post date:** [May 14, 2019, 1:58pm UTC](https://www.rubin.community/t/lsst-pex-config-config-fieldvalidationerror-in-tutorial/3702/3 "2019-05-14T13:58:26Z")

</div>

I thought so. I’m using the same shell for all the tutorials in turn and I’m pretty sure that the setup was doen correctly at the start. However, the process has been spread over more than two days and I’m no longer certain. I’ll re-run the tutorial from scratch and report back.

---

<div class="post-metadata">

**Author:** ![Brnikat](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/brnikat/32/866_2.png) [@Brnikat](https://www.rubin.community/u/Brnikat)\
**Post date:** [May 14, 2019, 4:14pm UTC](https://www.rubin.community/t/lsst-pex-config-config-fieldvalidationerror-in-tutorial/3702/4 "2019-05-14T16:14:25Z")

</div>

Mea culpa. Re-ran from stage4 onwards and everything went smoothly.  
My apologies for the false alarm.