Error using pretrigger when capturing more than one channel

I am having problems acquiring data with pretrigger samples when capturing more than one channel, using NI-PXI-6071E hardware and Labview's Analog Input VIs (Legacy NI-DAQ).
My goal is to trigger on one signal, while capturing another. Unfortunately, I cannot use the PFI0 for external triggering, as our cables/hardware have already been built, so I must use an analog input channel as the trigger. I understand that to do so I must capture both channels, and the channel that I wish to trigger off of must be the first channel in the list.
If I trigger and capture on the same channel (tried 1-4) then it
works great, regardless of the number of pre-trigger samples set. If I
capture more than one channel (passing the trigger channel first), with no pretrigger samples set, then triggering and capturing both work fine. However, if I do the same with the pretrigger sample > 0 I get the following error:
Error -10621 occurred at AI Control. Possible reason(s):
NI-DAQ LV: The specified trigger signal cannot be assigned to the trigger resource.
I don't se any such limitation explained in the user manual, and searching the forum, I have found a few other people that had the
same
problem
but they did not have solutions. Any ideas?
Solved!
Go to Solution.

I'm sorry for double-posting this. I was trying to post it in the DAQ board and it kept ending up on the LabView board.
If moderators have the ability to delete this thread you are welcome to do so.

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