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Bug

Attempting to use the Flow Direction tool in Python 3.6 with the Multiple Flow Direction (MFD) parameter returns an error message, “ERROR 999999: Something unexpected caused the tool to fail.”

Last Published: November 6, 2020 ArcGIS Pro
Bug ID Number BUG-000134228
SubmittedSeptember 29, 2020
Last ModifiedJuly 2, 2025
Applies toArcGIS Pro
Version found2.6.1
Operating SystemWindows OS
Operating System Version10.0 64 Bit
Version Fixed2.9
StatusFixed

Workaround

Run the tool through the geoprocessing (GP) tool for the Multiple Flow Direction (MFD) output.

Steps to Reproduce

Bug ID: BUG-000134228

Software:

  • ArcGIS Pro

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