Hi André,
since the error message says "there are no significant voxels" it is most likely that at least some voxels survived the masking. However, your model does not seem to explain sufficient variance in the inmask voxels. You should check the mask image whether it includes the brain regions you would expect. If not, you need to go back to the individual subjects and check the mask images from 1st level. Since some of your contrasts from 1st level seem to give results at group level, this is quite unlikely. Another reason could be that there are very inconsistent or small effects for some of the contrasts. Again, you will have to look at the 1st level results for the contrast that fails at group level.
Best,
Volkmar
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