topic Re: Error 999999 with Export Training Data for Deep Learning in ArcGIS Pro Questions

Error 999999 with Export Training Data for Deep Learning

cGISs — Mon, 29 Jun 2026 16:06:37 GMT

Hello, I've been attempting to use Export Training Data for Deep Learning, with an Input Raster of a TIFF file and an Input Feature Class consisting of traced vector lines, and have consistently received Error 999999. I'm trying to produce Labeled Tiles, and each of my vectors is labeled with a Class value of 1. I have tried the following measures:

Change the output folder location so that the character count of the path is under 128 characters
Reduced the Processing Extent in Environment to a fraction of what is was originally
Decrease the Tile and Stride Size (tile size was originally 2048 to match size of training data of original model, but when decreased to 256 it still doesn't work)
Tried with my project and all the associated files in my local C drive.

Any ideas on what else I can do? Any advice would be greatly appreciated.

Re: Error 999999 with Export Training Data for Deep Learning

cGISs — Mon, 29 Jun 2026 15:56:39 GMT

Currently running ArcGIS Pro 3.7 and deep-learning-essentials package version 3.7

Re: Error 999999 with Export Training Data for Deep Learning

ShaneONeill_144 — Tue, 30 Jun 2026 09:42:48 GMT

What is the geometry type of your input features — are they polylines or have you tried converting them to polygons?
Do the raster and features share the same coordinate system?

Re: Error 999999 with Export Training Data for Deep Learning

cGISs — Tue, 07 Jul 2026 15:36:41 GMT

The features are polylines. Haven't tried to convert them to polygons, but it may not be fitting for my purpose as some of the lines are supposed to be disconnected. Will look into it.
They did not share the same coordinate system. Unfortunately, changing them to the same still doesn't work. Regardless, thank you for the suggestions.

Re: Error 999999 with Export Training Data for Deep Learning

BotchaJayasri — Wed, 15 Jul 2026 15:48:45 GMT

Turn off parallel processing to stop the crash:

Open Export Training Data for Deep Learning.
Click the Environments tab at the top.
Scroll down to Parallel Processing.
Type 0 (zero) into the Parallel Processing Factor box.
Click Run.

Setting it to 0 forces ArcGIS Pro to process the chips sequentially on a single core, bypassing the buggy multi-threading code.

Let me know if the tool completes successfully or if it hits a different error code.

Re: Error 999999 with Export Training Data for Deep Learning

cGISs — Thu, 16 Jul 2026 19:30:21 GMT

Thank you for your suggestion. Unfortunately, setting the Parallel Processing Factor to 0 still brings up Error 999999.

Re: Error 999999 with Export Training Data for Deep Learning

cGISs — Tue, 21 Jul 2026 20:21:07 GMT

I got the tool to work by setting the Buffer Radius to 1. Thank you everyone for the suggestions!