%YEAR% not a valid variable for a creating a folder?

Hi,

when I try to use %YEAR% as a variable for creating a folder i get this error message:

The directory for Destination may be incorrect. The following variable may not be valid: %YEAR%

I was trying to create a folder for each day in this format:%YEAR%%MONTH%%DAY%, for example 20131217.

If i run this profile, SyncBack create a folder %YEAR%. What is wrong?

regards

Jockel.