I had the same error, so I ran the tool in the python window; lose the [] if you are only filling one field: # Import arcpy module import arcpy # Set geoprocessing environments arcpy.env.workspace = r"C:\Users\Documents\yourGeodatabase.gdb" arcpy.env.overwriteOutput = True # Fill missing values using a feature set and related table try: # Fill missing values in a feature class and a related table arcpy.FillMissingValues_stpm("Feature_in", "Feature_in_Filled", ["field1", "field2", "field3"], "AVERAGE", "K_NEAREST_NEIGHBORS", "", "", "", 100) except arcpy.ExecuteError: # If any error occurred when running the tool, print the messages print(arcpy.GetMessages())
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