I/O calibration tool doesn't work?

Execute bellow piece of code:
SQL> SET SERVEROUTPUT ON
DECLARE
lat INTEGER;
iops INTEGER;
mbps INTEGER;
BEGIN
-- DBMS_RESOURCE_MANAGER.CALIBRATE_IO (<DISKS>, <MAX_LATENCY>, iops, mbps, lat);
DBMS_RESOURCE_MANAGER.CALIBRATE_IO (75, 5, iops, mbps, lat);
DBMS_OUTPUT.PUT_LINE ('max_iops = ' || iops);
DBMS_OUTPUT.PUT_LINE ('latency = ' || lat);
dbms_output.put_line('max_mbps = ' || mbps);
end;
/SQL>   2    3    4    5    6    7    8    9   10   11   12  
DECLARE
*
ERROR at line 1:
ORA-29355: NULL or invalid MAX_LATENCY argument specified
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_RESOURCE_MANAGER", line 1279
ORA-06512: at line 7

The same error is received when we try to run I/O calibration tool from EM Console.