Dear Michael,
this is a warning message only. The first image of the time series is
the correct target, if you don't have a mean fMRI (i.e. if you opted for
"Register to 1st" in Realignment). Therefore, in this situation you
don't need to bother about this warning.
Volkmar
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0905&L=SPM&P=213455
<https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0905&L=SPM&P=213455>
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