SSRS SubReport Error

In need of some Tessitura friends who have spent WAY more time in SSRS reports than I...

I've copied and altered the canned Performance Seating Book report to fit some additional needs and I have it 97% working in TEST the way we want...BUT for whatever reason, it isn't running the subreport that is supposed to show the parameters used. What am I missing?

Here's the error:

Here are my subreport details:

Thanks in advance! 

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  • Oh yeah.  My development department is talking about taking Excel classes; Excel is going NOWHERE.  The good news is that, before they do those, they have had me doing a full on 7 part series on List Manager and Output Sets so that they can REALLY learn them, and they have been really good and attentive students, too.  So, hopefully at least, there is a marked decrease in the number of "I am having trouble doing this" requests that I get.  But yeah; people like their reports so that they can crunch their data... even if they have no idea what they are doing with it.