Count and Move Files

I am brand new to Hazel and have spent hours trying to get a rule to count the number of files in a folder and then move them to a subfolder with the date added as the folder name. Please can someone help? I am totally stuck.
To keep things simple (and hopefully clear) I have a folder on my Desktop called "Expenses" and once there are 10 PDF's in here I want Hazel to create a new folder (within the Expenses folder) using the current date as the name and move the 10 PDF's into that folder.
In my head I thought this would work, I have the following rule pointing at the Desktop-
If [all] of the following conditions are met-
[Number of items] [is] [10]
[Sort into Sub folder] with pattern [date added]
But it doesn't work
and i have no idea why not? Sorry if this is a dumb question.
To keep things simple (and hopefully clear) I have a folder on my Desktop called "Expenses" and once there are 10 PDF's in here I want Hazel to create a new folder (within the Expenses folder) using the current date as the name and move the 10 PDF's into that folder.
In my head I thought this would work, I have the following rule pointing at the Desktop-
If [all] of the following conditions are met-
[Number of items] [is] [10]
[Sort into Sub folder] with pattern [date added]
But it doesn't work
