i am trying to remove contacts of DE from receiving email which has a value in column named 'AffPersonPGUID' matching to the values present in a column by same name in DE named DE_ContactID using the below exclusion script
ROWCOUNT(LOOKUPROWS("DE_ContactID_Suppression", "AffPersonPGUID", AffPersonPGUID))> 0
the journey is not activating in which i have used this exclusion script in one of the emails, error being that AffPersonPGUID is an undefined variable.