I've seen similar posts to this one, but none of the solutions suggested in those have solved my problem.

Here's the model.txt file (truncated after the first four subjects):

Data:Volume
Output:LME_results
MASK:automask+tlrc.BRIK
Model:Cond*Valence
COV:
RanEff: 1
VarStr: 0
CorStr: 0
SS:sequential
PosDecrease-PosView
positive*decrease-positive*view
NegDecrease-NegView
negative*decrease-negative*view
Clusters:
Subj Cond Valence InputFile
1002 decrease negative ./1002_slide_d_neg_mean_resampled_short+tlrc
1002 decrease positive ./1002_slide_d_pos_mean_resampled_short+tlrc
1002 view negative ./1002_slide_v_neg_mean_resampled_short+tlrc
1002 view positive ./1002_slide_v_pos_mean_resampled_short+tlrc
1003 decrease negative ./1003_slide_d_neg_mean_resampled_short+tlrc
1003 decrease positive ./1003_slide_d_pos_mean_resampled_short+tlrc
1003 view negative ./1003_slide_v_neg_mean_resampled_short+tlrc
1003 view positive ./1003_slide_v_pos_mean_resampled_short+tlrc
1004 decrease negative ./1004_slide_d_neg_mean_resampled_short+tlrc
1004 decrease positive ./1004_slide_d_pos_mean_resampled_short+tlrc
1004 view negative ./1004_slide_v_neg_mean_resampled_short+tlrc
1004 view positive ./1004_slide_v_pos_mean_resampled_short+tlrc
1005 decrease negative ./1005_slide_d_neg_mean_resampled_short+tlrc
1005 decrease positive ./1005_slide_d_pos_mean_resampled_short+tlrc
1005 view negative ./1005_slide_v_neg_mean_resampled_short+tlrc
1005 view positive ./1005_slide_v_pos_mean_resampled_short+tlrc


And here's the error message that occurs after it runs for a minute or so:

Error in if (RanEff) { : missing value where TRUE/FALSE needed
Execution halted

My version of AFNI is AFNI_2008_02_01_1144, compiled on May 30 of this year.

I eventually want to include covariates, which is why I'm using 3dLME.

Phil