laptop and a wrench

Bug

The arcpy.SummarizeWithin_analysis function fails intermittently with the generic error message, "Error: 999999 Something unexpected caused the tool to fail" if the tool is executed using the multiprocessing Python module.

Last Published: April 10, 2019 ArcGIS Pro
Bug ID Number BUG-000121570
SubmittedApril 8, 2019
Last ModifiedJune 26, 2025
Applies toArcGIS Pro
Version found2.2.1
Version Fixed2.9
StatusFixed

Steps to Reproduce

Bug ID: BUG-000121570

Software:

  • ArcGIS Pro

Get notified when the status of a bug changes

Download the Esri Support App

Discover more on this topic

Esri Community

Search for related information

Training

Find training related to this topic

ArcGIS Ideas

Explore ideas and give feedback

Get help from ArcGIS experts

Contact technical support

Download the Esri Support App

Go to download options