Purging days

I have a problem trying to Purges days in a agent with Lotus Notes This is what I have so far, I have created an agent that delete files within the binder and the binder itself. My problem come in at, I need to delete the binders and files within 90 days. I keep getting an error message telling me that my index is to match. I have no clue what that mean. Can someone pls help me.

Thanks

Regina