The best I have would be to break apart the expression into smaller chunks putting those into Text boxes to try to figure out which piece is causing the issue, one of my counterparts taught me that trick years ago, but I am still not a very good developer unfortunately! 🙂 Hope this may help if you are still working on it.
The only other place I could point is the Online Help for the different functions you are using to check things there.
Regards,
Brett
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