Thanks, Gang!

Unfortunately, when I try using the -qVars option with BRAIN_FC, the 'Incorrect level coding in variable BRAIN_FC : :' error still remains.

For convenience sake, I've listed out the alternatives I've tried thus far (below, all of which give me the same error). I've also attached an example data table (first 9 rows) in case I am formatting something incorrectly.

1. Adding "-vVars 'BRAIN_FC", both with and without "-vVarCenters"
2. Adding "-qVars 'COV1,COV3,BRAIN_FC'" and "-qVarCenters '0.0,0.0,0.0'"
3. Removing "-gltCode brain 'BRAIN_FC :'"
4. Removing -gltCode brainXrisk 'BRAIN_FC : RISK : 1*high -1*low'"