Tool failure during classification wizard

[ChristopherBertrand]

In the Training phase of the Classification Wizard (Supervised, Support Vector Machine selected) an error message is displayed saying the tool has failed.  It gets to just past 50% of "generating segmented dataset" and the tool fails. Detail of the error is a Error 999999 and several tables not found.  The input is a Pro created mosaic of NAIP images. The uncompressed file is 20.5 GB. Why is the tool failing?  Is it the tool? Is it the input data?  Is it a lack of sufficient memory?  An photo of the error message is attached.

[DanPatterson_Retired]

To rule out some of these, try a sample of the same image type

[Danvey]

Did you ever figure out what was causing the tool to fail? I am receiving the same error. This is the first time I've tried to do image classification within ArcGIS Pro.

ERROR 999999: Something unexpected caused the tool to fail. Contact Esri Technical Support (http://esriurl.com/support) to Report a Bug, and refer to the error help for potential solutions or workarounds.
The table was not found. [VAT_Segmented_202105101417354459224_interIndex]
The table was not found. [VAT_Segmented_202105101417354459224_interIndex]
Failed to execute (TrainSupportVectorMachineClassifier).
Failed at Monday, May 10, 2021 2:26:33 PM (Elapsed Time: 2.04 seconds)

[wraymond]

I have had this same issue. I think this may be why I get another error in the classification step. See https://community.esri.com/t5/arcgis-pro-questions/error-in-classify-step-of-image-classification-wi... 

[CathyWilson2]

I am getting the same message. I was able to to the whole wizard successfully and am now trying to do the same steps on an overlapping image collected at the same time. I don't know what table it is talking about. The training samples?