FortiSwitch error counters HOW DO I CLEAR THEM ?

How do I Clear these counters  ?

I have tried :

diagnose switch physical-ports stats  clear 

diagnose switch physical-ports stats clear port-stats

diagnose switch physical-ports stats clear-local port21-24

Port(port21) is Admin up, line protocol is up

Interface Type is Serial Gigabit Media Independent Interface(SGMII/SerDes)

Address is 70:4C:A5:1E:56:8E, loopback is not set

MTU 9216 bytes, Encapsulation IEEE 802.3/Ethernet-II

full-duplex, 100 Mb/s, link type is manual

input  : 157121981 bytes, 594536 packets, 84 errors, 35 drops, 1 oversizes

         594290 unicasts, 0 multicasts, 162 broadcasts, 0 unknowns

output : 2725563942 bytes, 21566215 packets, 0 errors, 281 drops, 713 oversizes

         465662 unicasts, 10826813 multicasts, 10273740 broadcasts

25 fragments, 0 undersizes, 0 collisions, 0 jabbers

Port(port22) is Admin up, line protocol is up

Interface Type is Serial Gigabit Media Independent Interface(SGMII/SerDes)

Address is 70:4C:A5:1E:56:8F, loopback is not set

MTU 9216 bytes, Encapsulation IEEE 802.3/Ethernet-II

full-duplex, 100 Mb/s, link type is manual

input  : 244637958 bytes, 996696 packets, 139386 errors, 82 drops, 2 oversizes

         856871 unicasts, 172 multicasts, 267 broadcasts, 0 unknowns

output : 3837104013 bytes, 29948379 packets, 0 errors, 1096 drops, 533 oversizes

         752543 unicasts, 14634155 multicasts, 14561681 broadcasts

29547 fragments, 0 undersizes, 0 collisions, 0 jabbers

Port(port23) is Admin up, line protocol is up

Interface Type is Serial Gigabit Media Independent Interface(SGMII/SerDes)

Address is 70:4C:A5:1E:56:90, loopback is not set

MTU 9216 bytes, Encapsulation IEEE 802.3/Ethernet-II

full-duplex, 100 Mb/s, link type is manual

input  : 235814302 bytes, 847219 packets, 640 errors, 35 drops, 2 oversizes

         846330 unicasts, 0 multicasts, 249 broadcasts, 0 unknowns

output : 4186063208 bytes, 24330777 packets, 0 errors, 219 drops, 724 oversizes

         672638 unicasts, 11867860 multicasts, 11790279 broadcasts

202 fragments, 0 undersizes, 0 collisions, 0 jabbers

Port(port24) is Admin up, line protocol is up

Interface Type is Serial Gigabit Media Independent Interface(SGMII/SerDes)

Address is 70:4C:A5:1E:56:91, loopback is not set

MTU 1500 bytes, Encapsulation IEEE 802.3/Ethernet-II

full-duplex, 100 Mb/s, link type is manual

input  : 253728916 bytes, 1087528 packets, 50245 errors, 86994 drops, 0 oversizes

         985253 unicasts, 50524 multicasts, 1506 broadcasts, 0 unknowns

output : 5507707445 bytes, 33822455 packets, 0 errors, 4344 drops, 0 oversizes

         776622 unicasts, 16337065 multicasts, 16708768 broadcasts

14031 fragments, 0 undersizes, 0 collisions, 0 jabbers