Error while attempting to use chopper as reference with lock-in Amplifier in LabVIEW.

[LVQs]

I am using LabVIEW 2021, a Stanford Research Systems SR850 Lock-in amplifier (LIA) communicating through a GPIB-NI488.2 bus, and an SR540 chopper. I currently have a laser with split beams, one going through the chopper to one detector (to the LIA as signal input A), the other going to a detector for normalization (to the LIA as Aux In 1 (AI1)). The SR540 is used as the external reference (to the LIA as Reference), and is selected for TTL Rising Edge. 

I have downloaded the drivers through NI MAX, following the GPIB procedure I have talked to my instrument (the LIA), and opened SR850 examples through LabVIEW. 

The sample VIs work fine, as in I do not get any errors, however I see none that use an external reference. When I input the "configure reference" .vi that I downloaded through NI with the drivers, I get an undefined error -1073999877, or #0XBFFC0FFB. I don't find much information on these searching the web for an explanation. At first I thought it was the location at which I was placing this .vi in the code, and I figured it has to come before my gain configuration, because my signal is entirely unstable without it, but I have tried placing the reference before and after other .vi's and it still errors and carries the error through. There is a picture of the code attached. This is the example code for generating a trace. It works fine until I add the configure reference vi which is circled. My chopper frequency is shown on the LIA so I know the reference is picking it up correctly, and I can read the voltage from the AUX In correctly.

Ultimately goal is to output the R/AI1 and Theta values of the chopped beam where the AI1 is the unchopped beam, using the chopper frequency as reference.

If anyone has any suggestions or advice, I would appreciate any help. I also added photos of the chopper frequency and that frequency being picked up by the lock in amplifier's "reference" input.

LabVIEW Snippet of example with added reference viChopper frequencyfrequency ~chopper's frequency picked up by lock in amplifier as an external reference