I'm trying to use a TagTot that is Event Weighted instead of Time Weighted. I'm looking to sum the a series of discrete values over the duration of a process we are running. There are two separate calculations that use this function, then one that sums these together and passes it to an event frame. I believe I've set up the equation as it was shown in the Help guild, but I receive an error message "Invalid Expression ',' " in reference to the comma between the final two arguments. I've looked up white paper and a couple of threads on PI Square, they point to the same syntax as I'm using. I'm running PSE 2018 SP2 which seems to support this function from what I can tell. Could someone offer me a suggestion as to what I might be doing incorrectly. Let me know if there is additional information I can provide that might assist.