The error message tells you what is wrong.

>"This expression must have a constant value."

i.e. This expression must NOT be a variable.

Unfortunately, CF cannot point precisely at the expression - it can only tell 
you that it is within the cffunction tag - which it does by highlighting the 
last line of that tag.

However, there are only two variables within the tag - argumentCollection and 
dsn - so either/both of these are the culprit that the error is referring to.

However, neither of these belong in a cffunction tag - they should be passed in 
as an argument when you call the function!


Also, the last few lines of your code show that you are not var scoping your 
variables!

That needs to be fixed or it risks causing you big headaches.
You can find unscoped variables using varScoper - http://varscoper.riaforge.org/



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