Help with BLEmail script

[bmts]

I downloaded and installed the BLEmail plugin (Thanks Blade). I'm now trying to create an event that trigger "on email received". I wrote this script in the Action list:

&if hs.Plugin("BLEmail").MessageSubject= "Arm Stay" then hs.Plugin("BLDSC").PartitionArmStay(1)

When running this script I get the error message "Running script, init error: Syntax error" in the event log.

What am I doing wrong?