Classify Pixels Using Deep Learning failure

[MartyRyan]

In ArcGIS Pro 2.9.1 and trying to run Classify Pixels tool on a Mosaic Dataset. Getting multiple failures with this message:

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.
Unable to prepare input raster(s) for the python raster function.
Unable to open the specified raster. [raster]
Unable to extract and reorder raster bands. Invalid band index encountered. [requested band 3 at position 3]
Unable to prepare input raster(s) for the python raster function.
Unable to open the specified raster. [raster]
Unable to extract and reorder raster bands. Invalid band index encountered. [requested band 3 at position 3]
Unable to prepare input raster(s) for the python raster function.
Unable to open the specified raster. [raster]
Unable to extract and reorder raster bands. Invalid band index encountered. [requested band 3 at position 3]
Failed to execute (ClassifyPixelsUsingDeepLearning).

Is a MDS not a proper input for the Classify Pixels tool? Thanks

[DanPatterson · Accepted solution]

Classify Pixels Using Deep Learning (Image Analyst)—ArcGIS Pro | Documentation

The input raster dataset to classify. The input can be a single raster or multiple rasters in a mosaic dataset, an image service, or a folder of images.

Which suggests that prior steps haven't been completed, the model definition file isn't good, or you have the wrong package versions installed if it has worked before 

[MartyRyan]

Thanks, Dan - this is actually the first time I've tried to use this tool on a Mosaic Dataset - previously I've run it on a .tif image. I will also check the model definition file. 

[DeepinderUppal]

Hello did you get things to work? -and if so hat seemed to be the problem? Im running identify objects using deep learning and get the identical error...