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According this line,

-qVars 'age,gender' \

'age' and 'gender' are the only quantitative variables. First of all, 'gender' is not a quantitative variable. Also, do you have other quantitative variables in your model? All those 3 -gltCode lines are not correct. Follow the examples in the 3dMVM help. Consider using the 3dMVM validator:

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Gang