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generating training samples from seed points keeps failing

Betsabede_la_Barreda

I'm trying to generate training samples from this raster. I have used the "create accuracy assessments points" for getting the random_points shapefile (attached).
I would like now to generate samples from seed points and then use these as my training classification input.

I keep getting this error:

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.
Failed to execute (GenerateTrainingSamplesFromSeedPoints).