Rule depending on Folder Size

Hello
I just cannot get this to work:
I would like to watch the size of a folder and taking action beyond a size in GB. So my conditions are:
The watched folder in Folder list > Size > is greater than > 5GB
Do the following:
Display notification
Run Automator workflow
The rule does not show me a Notification nor it sends the mail, what I am doing wrong?
Thanks for any help!
PS: Would have posted a screenshot but I can't upload a pic here...
I just cannot get this to work:
I would like to watch the size of a folder and taking action beyond a size in GB. So my conditions are:
The watched folder in Folder list > Size > is greater than > 5GB
Do the following:
Display notification
Run Automator workflow
The rule does not show me a Notification nor it sends the mail, what I am doing wrong?
Thanks for any help!
PS: Would have posted a screenshot but I can't upload a pic here...