WHAT EXACTLY is the syntax of LB::staus??

I fond in the document, the syntax is

 

LB::status pool member

 

LB::status pool member

 

 

but when I commit the irule, GTM told me it should be LB::status pool member .

 

 

and I followed the instruction, unfornately, when the irule was exeucuted, the output of the error show me it should be something like "LB::status pool "

 

 

any ideas???