My member PS is bad block ! but i cannot clear block : i use command "su exec raidtool -w 0 " for clear block but its output " Error : Too may paramaters " so the command not finish

I have one group with 5 member ( PS6000VX )

Now , member03 is warning The RAIDSET lost block

When i ssh to member03 and use CLI   " su exec raidtool "  ---> its output 4 bad block on LUN 0

i use command "su exec raidtool  -w 0 "  for clear block but its output   " Error : Too may paramaters " so the command not finish

Can you help me why Error : Too may paramaters ?  and help me resolve the problem Bad Block

My members use V 5.02

Thanks