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Child process '0' crashed - Running (.fme) Mapping Files is deprecated

  • March 16, 2026
  • 1 reply
  • 19 views
arthur_bazin
Contributor
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Hello,

I have a workspace with a custom transformer that does lot’s of things but we can consider this :

  • Get a list of feature type to read
  • Read data with a feature writer
  • Make a bunch of tests with spatial relators, feature merge and plenty of transformers
  • If some error are found : those objects are outputed
  • If no error are found, nothing is outputed.

In local, with FME Form, no problem, it works, nothing is returned :

REGLE_TOPOLOGIE KO_PONCTUEL_TOUCHES_LINEAIRE Output Renamer/Nuker (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
REGLE_TOPOLOGIE KO_PONCTUEL_INTERSECTS_PONCTUEL Output Renamer/Nuker (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
REGLE_TOPOLOGIE KO_LINEAIRE_INTERSECTS_LINEAIRE Output Renamer/Nuker (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
REGLE_TOPOLOGIE KO_LINEAIRE_CROSSES_LINEAIRE Output Renamer/Nuker (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
REGLE_TOPOLOGIE KO_SURFACIQUE_OVERLAPS_SURFACIQUE Output Renamer/Nuker (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
REGLE_TOPOLOGIE KO_LINEAIRE_OVERLAPS_LINEAIRE Output Renamer/Nuker (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)

After publishing to FME Flow, my workspace’s job succeded but failed…

Every process have been done in thre workspace and the generated files are good, exactly what I expected. But the log display this :

Translation FAILED with 107 error(s) and 11 warning(s) (0 feature(s) output)

When I look at the log I can see this :

984	2026-3-16 11:26:36 | Child process '0' crashed
985	2026-3-16 11:26:34 | 0>   System Status: 136.83 GB of disk space available in the FME temporary folder (C:\Windows\TEMP\fmeengines\localhost_Engine1)
986	2026-3-16 11:26:34 | 0>   System Status: 16.00 GB of physical memory available
987	2026-3-16 11:26:34 | 0>   System Status: 64.00 GB of virtual memory available
988	2026-3-16 11:26:34 | 0>   START - ProcessID: 11480, peak process memory usage: 64808 kB, current process memory usage: 60884 kB
989	2026-3-16 11:26:34 | 0>   Running (.fme) Mapping Files is deprecated. Please see http://fme.ly/fmeMappingFileDeprecation for more information
2026-3-16 11:26:34 | 0>   FME Configuration: Command line arguments are `C:\Program Files\FMEFlow\Server\fme\fmeworker' `C:\Windows\TEMP\fmeengines\localhost_Engine1\childProcMap1773656793910_11024.fme' `-WORKER_CAPABILITY' `247L1402' `LOG_FILENAME' `C:\ProgramData\Safe Software\FMEFlow\resources\logs\engine\current\jobs\0\job_357\job_357_0.log' `-LOG_PREPEND_ID' `0' `--SOURCE_PORT_OUT' `64072' `--SOURCE_PORT_IN' `64071'

This part of the log is linked to the start of the custom transformer “REGLE_TOPOLGY” which is started as the child process 0. 
But this process finish without any error : 

1177	2026-3-16 11:26:35 | 0>   REGLE_TOPOLOGIE_KO_PONCTUEL_TOUCHES_LINEAIRE1773656769 Output Collector (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
1178	2026-3-16 11:26:35 | 0>   REGLE_TOPOLOGIE_KO_PONCTUEL_INTERSECTS_PONCTUEL1773656769 Output Collector (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
1179	2026-3-16 11:26:35 | 0>   REGLE_TOPOLOGIE_KO_LINEAIRE_INTERSECTS_LINEAIRE1773656769 Output Collector (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
1180	2026-3-16 11:26:35 | 0>   REGLE_TOPOLOGIE_KO_LINEAIRE_CROSSES_LINEAIRE1773656769 Output Collector (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
1181	2026-3-16 11:26:35 | 0>   REGLE_TOPOLOGIE_KO_SURFACIQUE_OVERLAPS_SURFACIQUE1773656769 Output Collector (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
1182	2026-3-16 11:26:35 | 0>   REGLE_TOPOLOGIE_KO_LINEAIRE_OVERLAPS_LINEAIRE1773656769 Output Collector (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)
1183	2026-3-16 11:26:35 | 0>   TransporterSender (TransporterFactory): Sending end of data signal to host 'localhost' on port '64072'
1184	2026-3-16 11:26:35 | 0>   TransporterSender (TransporterFactory): Successfully sent end of data signal to host 'localhost' on port '64072'
1185	2026-3-16 11:26:35 | 0>   TransporterSender (TransporterFactory): Shutting down transporter for host 'localhost' on port '64072'
1186	2026-3-16 11:26:35 | 0>   TransporterSender (TransporterFactory): Successfully shut down transporter for host 'localhost' on port '64072'
1187	2026-3-16 11:26:35 | 0>   TransporterSender (TransporterFactory): Sent 0 features
1188	2026-3-16 11:26:35 | 0>   Sub-translation was SUCCESSFUL with 1 warning(s) (0 feature(s) output)
1189	2026-3-16 11:26:35 | 0>   FME Session Duration: 0.7 seconds. (CPU: 0.5s user, 0.2s system)
1190	2026-3-16 11:26:35 | 0>   END - ProcessID: 11480, peak process memory usage: 175520 kB, current process memory usage: 155172 kB

It looks like FME Flow consider the fact that no objects is returned as a source of error.

Have someone ever had this problem ?

Tips & tricks with data : https://blog.arthurbazin.com

    1 reply

    zoe.forbes
    Safer
    Forum|alt.badge.img+5
    • zoe.forbesSafer
    • Safer
    • March 17, 2026

    Hi ​@arthur_bazin,

    Thanks for your post! I had a read through but nothing’s jumping out immediately. Would you please consider submitting a support ticket for this problem in addition to your post? Problems with mapping files are often quite involved, so it would be good if we could see your full job logs. 

    If you submit a case, please also include the following after attempting to run on Flow:

    • Resources/logs/core/current/processmonitorcore.log 
    • Resources/logs/core/current/fmeserver.log 
    • Resources/logs/engine/current/processmonitorengine.log.

    If any other Community members see this post and want to contribute please don’t let this stop you!

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