I ran the delete field tool deliberately on a geopackage to see what happens and I got an error message. This did not surprise me as I have read in the help that I cannot drop fields in a geopackage featureclass. Whilst that is something I would like ESRI to resolve what I was surprised is that there is no documentation on error code 002557 as you can see below.
002557 pops up in the strangest places for different reasons
BUG-000143509: The Delete Field tool in ArcGIS Pro fails to execute.. (esri.com)
# -- accessed via arcpy and numpy # 2557 is there, must be new messages array([['2555', 'The ArcGIS Data Store (relational) is in read-only mode and new items cannot be published. Please check available disk space.'], ['2556', 'Attribute rule not found: %s.'], ['2557', 'Cannot delete field %1 from %2.'], ['2558', 'Must specify attribute rule names.'], ['2559', 'Invalid combination of arguments.']], dtype='<U125')
@DanPatterson , interesting you found that bug report, I did search online help for the code and could not find anything specific. Interesting the error message is for a completely different scenario, deleting all fields in a shapefile and I was trying to simply delete a single field from a geopackage. Either way does seem like the help documentation needs to be updated.
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