I think that, in going through the warping process, your data set has lost its table-- so, probably when you view 'mask_aseg_nl_1.4+tlrc' in an AFNI window, you don't see labeltable functionality on it.

However, I have it on good authority (-> Rick's) that you can reattach it or copy it using 3drefit, with either of the following options:

-labeltable TTT Inset the label table TTT in the .HEAD file.
The label table format is described in README.environment
under the heading: 'Variable: AFNI_VALUE_LABEL_DTABLE'
See also -copytables

-copytables tabset Copies labeltables AND/OR atlas point lists, if any,
from tabset to the input dataset.
'-copyaux' occurs BEFORE the '-sub' operations below,
so you can use those to alter the auxiliary data
that is copied from tabset.


After that, you should be set for 3dNetCorr.

--pt