Problem Creating Directory

I have a package that calculates a date, downloads a zip file and then the problems begin.. I WANT to have it create a folder using the same filename (left of the .zip) but my problem appears to be how I'm doing this. It is a calculated variable that has scope for the whole package. I set the source property to false and hard coded the parent directory and then have an expression that concatenates the constant (parent) directory with the global variable and my intent is to use this in place of the source value for the create directory (I then unzip the file into that directory and have a for each loop to process said files and rename them). My problem is that, for some reason, VS calculates the expression and I get an error that says The connection xxxxxx is not found. This error is thrown by the Connections collection when the specific connection element is not found. (xxxxxx is the calculated direcotry and is correct). Why is it doing this calculation and erroring, its job is to create the folder??? Thanks in advance.