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Opened by Philipp Wolfer@phw

Could not insert metadata for item ... Unable to insert multiple values for ... single valued property `nie:contentCreated'

I get the following error repeating message in the logs for multiple files:

Aug 03 07:15:36 fry tracker-extract[7336]: Could not insert metadata for item "file:///home/phw/Dokumente/JAP/jobboard-logos/hijob.png": Unable to insert multiple values for subject `urn:uuid:c2c07626-635a-581d-d4a7-916876c91cec' and single valued property `nie:contentCreated' (old_value: '<untransformable>', new value: '<untransformable>')
Aug 03 07:15:36 fry tracker-extract[7336]: If the error above is recurrent for the same item/ID, consider running "tracker-extract" in the terminal with the TRACKER_VERBOSITY=3 environment variable, and filing a bug with the additional information

Doing as said above and running TRACKER_VERBOSITY=3 tracker extract /home/phw/Dokumente/JAP/jobboard-logos/hijob.pn outputs:

** Message: 07:23:36.580: Starting tracker-extract 2.1.0
** Message: 07:23:36.580: General options:
** Message: 07:23:36.580:   Verbosity  ............................  0
** Message: 07:23:36.580:   Sched Idle  ...........................  1
** Message: 07:23:36.580:   Max bytes (per file)  .................  1048576
Setting scheduler policy to SCHED_IDLE
Setting priority nice level to 19
Loading extractor rules... (/usr/share/tracker-miners/extract-rules)
  Loaded rule '10-abw.rule'
  Loaded rule '10-bmp.rule'
  Loaded rule '10-comics.rule'
  Loaded rule '10-dvi.rule'
  Loaded rule '10-ebooks.rule'
  Loaded rule '10-epub.rule'
  Loaded rule '10-flac.rule'
  Loaded rule '10-gif.rule'
  Loaded rule '10-html.rule'
  Loaded rule '10-ico.rule'
  Loaded rule '10-jpeg.rule'
  Loaded rule '10-mp3.rule'
  Loaded rule '10-msoffice.rule'
  Loaded rule '10-oasis.rule'
  Loaded rule '10-pdf.rule'
  Loaded rule '10-png.rule'
  Loaded rule '10-ps.rule'
  Loaded rule '10-svg.rule'
  Loaded rule '10-tiff.rule'
  Loaded rule '10-vorbis.rule'
  Loaded rule '10-xmp.rule'
  Loaded rule '10-xps.rule'
  Loaded rule '11-iso.rule'
  Loaded rule '11-msoffice-xml.rule'
  Loaded rule '15-gstreamer-guess.rule'
  Loaded rule '15-playlist.rule'
  Loaded rule '15-source-code.rule'
  Loaded rule '90-gstreamer-audio-generic.rule'
  Loaded rule '90-gstreamer-image-generic.rule'
  Loaded rule '90-gstreamer-video-generic.rule'
  Loaded rule '90-text-generic.rule'
Extractor rules loaded
MIME type guessed as 'image/png' (from GIO)
Using /usr/lib/tracker-miners-2.0/extract-modules/libextract-png.so...
Calling png_get_text() returned 0 (< 1)
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix nie: <http://www.semanticdesktop.org/ontologies/2007/01/19/nie#> .
@prefix nmm: <http://www.tracker-project.org/temp/nmm#> .
@prefix nfo: <http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#> .

<file:///home/phw/Dokumente/JAP/jobboard-logos/hijob.png> nie:contentCreated "2018-08-02T13:59:18+0200" ;
  nfo:verticalResolution 300 ;
  nfo:horizontalResolution 300 ;
  nfo:width 300 ;
  nmm:dlnaProfile "PNG_LRG" ;
  a nfo:Image , nmm:Photo ;
  nmm:dlnaMime "image/png" ;
  nfo:height 100 ;
  nie:title "hijob" .

I cannot see any obvious here, the value of nie:contentCreated looks valid. What else can I provide / look into to debug this?