CALL _SYS_AFL "insufficient privilege: Not authorized"

I'm trying to use Hana's AFL K Means clustering algorithm,

I made some adjustments to this code:

https://github.com/saphanaacademy/PAL/blob/master/Code%20Snippets/PAL%2054%20Clustering%20-%20Kmeans%20Best%20K.sql

Provided in this SAP Hana Academy tutorial:

https://www.youtube.com/watch?v=VGsNRG3NkTs

Everything has been executed with the SYSTEM user, but in this line:

CALL _SYS_AFL.PAL_KM (V_KM_DATA, #KM_PARAMS, KM_RESULTS, KM_CENTERS) WITH OVERVIEW;

I get this error:

Could not execute 'CALL _SYS_AFL.PAL_KM (V_KM_DATA, #KM_PARAMS, KM_RESULTS, KM_CENTERS) WITH OVERVIEW'

SAP DBTech JDBC: [258]: insufficient privilege: Not authorized

HOW CAN I SOLVE THIS ERROR?

This is the complete code I've been using. Executed with SYSTEM user:

CREATE TYPE PAL_T_KM_DATA AS TABLE (STORE_SK INTEGER, COST DOUBLE, SALES DOUBLE, TRAFFIC_BAND DOUBLE, CUSTOMER_COUNT DOUBLE, GENDER_F DOUBLE, GENDER_M DOUBLE);

CREATE TYPE PAL_T_KM_PARAMS AS TABLE (NAME VARCHAR(60), INTARGS INTEGER, DOUBLEARGS DOUBLE, STRINGARGS VARCHAR(100));

CREATE TYPE PAL_T_KM_RESULTS AS TABLE (ID INTEGER, CENTER_ID INTEGER, DISTANCE DOUBLE);

CREATE TYPE PAL_T_KM_CENTERS AS TABLE (CENTER_ID INTEGER, COST DOUBLE, SALES DOUBLE, TRAFFIC_BAND DOUBLE, CUSTOMER_COUNT DOUBLE, GENDER_F DOUBLE, GENDER_M DOUBLE);

CREATE COLUMN TABLE PAL_KM_SIGNATURE (ID INTEGER, TYPENAME VARCHAR(100), DIRECTION VARCHAR(100));

INSERT INTO PAL_KM_SIGNATURE VALUES (1, 'TRIALFIRE_CLIENTDATA.PAL_T_KM_DATA', 'in');

INSERT INTO PAL_KM_SIGNATURE VALUES (2, 'TRIALFIRE_CLIENTDATA.PAL_T_KM_PARAMS', 'in');

INSERT INTO PAL_KM_SIGNATURE VALUES (3, 'TRIALFIRE_CLIENTDATA.PAL_T_KM_RESULTS', 'out');

INSERT INTO PAL_KM_SIGNATURE VALUES (4, 'TRIALFIRE_CLIENTDATA.PAL_T_KM_CENTERS', 'out');

--GRANT SELECT ON PAL_KM_SIGNATURE TO SYSTEM;

CALL SYSTEM.AFL_WRAPPER_GENERATOR ('PAL_KM', 'AFLPAL', 'KMEANS', PAL_KM_SIGNATURE);

-- app setup

CREATE VIEW V_KM_DATA AS

  SELECT STORE_SK, SUM(COST), SUM(SALES), MAX(TRAFFIC_BAND), MAX(CUSTOMER_COUNT), MAX(GENDER_F), MAX(GENDER_M)

  FROM "TRIALFIRE_CLIENTDATA"."STORE_SALES_TRAITS"

  GROUP BY STORE_SK

  ;

CREATE COLUMN TABLE KM_RESULTS LIKE PAL_T_KM_RESULTS;

CREATE COLUMN TABLE KM_CENTERS LIKE PAL_T_KM_CENTERS;

-- app runtime

DROP TABLE #KM_PARAMS;

CREATE LOCAL TEMPORARY COLUMN TABLE #KM_PARAMS LIKE PAL_T_KM_PARAMS;

INSERT INTO #KM_PARAMS VALUES ('THREAD_NUMBER', 2, null, null);

INSERT INTO #KM_PARAMS VALUES ('GROUP_NUMBER_MIN', 50, null, null);

INSERT INTO #KM_PARAMS VALUES ('GROUP_NUMBER_MAX', 250, null, null);

INSERT INTO #KM_PARAMS VALUES ('INIT_TYPE', 1, null, null);

INSERT INTO #KM_PARAMS VALUES ('DISTANCE_LEVEL', 2, null, null);

INSERT INTO #KM_PARAMS VALUES ('MAX_ITERATION', 100, null, null);

INSERT INTO #KM_PARAMS VALUES ('NORMALIZATION', 0, null, null);

INSERT INTO #KM_PARAMS VALUES ('EXIT_THRESHOLD', null, 0.0001, null);

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