Hi Victoria,
I think the important part of your error code is "Please check your data: There are no significant voxels.".
Do the preprocessed images of the error-causing subjects look ok?
If you look at the beta images of your whole brain analysis, do you find significant voxels in the area of your ROI in these subjects?
A bigger ROI should increase your chance of catching significant voxels.
Hope this helps.
Best,
Mike
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