Hi Matthew,
Thanks for your quick response - I just wanted to update this thread so that if anyone else encounters this problem they have an answer ..
My problem was that I was getting this error for every slice of the brain. I have since figured it out that it was because I was including subjects that had 0 data for some runs for that particular contrast. It seems like the higher level analyses run into issues if there are not corresponding timeseries for all runs you are trying to concatenate.
Thanks !
Danielle
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