windows - Powershell script throwing error: You cannot call a method on a null-valued expression -


just trying troubleshoot issue. think may powershell script wrong. please forgive me if answer obvious. here have:

$pluginpath = 'd:\program files\nsclient++\plugins' $results = cmd /c "$pluginpath\ipmiutil.exe" sensor -s  # status of memory $memstatus = ($results | select-string "snum 60").line.split('|')[-1] -replace '\s+'  error: invalidoperation: (split:string) [], runtimeexception

and 

notification type: problem  service: hardware host: x state: critical  date/time: x  additional info:  **you cannot call method on null-valued expression.**

any massively appreciated


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