In ArcGIS Online, when running the Find Nearest tool, if the 'Limit the number of nearest locations to' is unchecked, the tool returns the error message, "Error unable to complete operation."

Solución alternativa

Select the check box for 'Limit the number of nearest locations to' and input the desired value, or the default limit if the box is left unchecked, 100, as stated in the documentation: https://doc.arcgis.com/en/arcgis-online/analyze/find-nearest.htm

Pasos para reproducir