Error user definied parameter throws lib-error

[IteaAgain]

On debian VM defined user parameters

UserParameter= raid.array.md0.status, pwsh -file /home/iteanova/Get-RAIDStatus-md0.ps1 
 UserParameter= raid.array.md1.status, pwsh -file /home/iteanova/Get-RAIDStatus-md1.ps1

that starts a Powershell Script that get the result "active"

iteanova@iteanova003:~$ cat Get-RAIDStatus-md0.ps1

((get-content /proc/mdstat) -like "md0*").split(" ").trim()[2] 
  iteanova@iteanova003:~$ pwsh Get-RAIDStatus-md1.ps1  active

but unhappy, in the "Latest Data" of the debian VM, i got that messag

[TABLE="class: list-table"]
[TR]
[TD="class: nowrap"]2018-03-26 19:37:23[/TD]
 			[TD] 			
 libust[28645/28645]: Warning: HOME environment variable not set. Disabling LTTng-UST per-user tracing. (in setup_local_apps() at lttng-ust-comm.c:375) active 			[/TD]
 		[/TR]
[/TABLE]

somehow those warning message from libust is coming into the script-output. Any idea i get rid of it?

Thank you

Chris