[Freesurfer] error in lme_mass_fit using matlab tools

Dear Freesurfer experts,

I have a question about fitting linear mixed models to mass-univariate data using the lme tools in matlab.

I am currently trying to compute the initial vertex-wise temporal covariance estimates by [lhTh0lhRe] = lme_mass_fit_EMinit(X,[2],ni,lhcortex,3]

However, I keep getting this error message:

Undefined function 'matlabpool' for input arguments of type 'char'.

Error in lme_mass_fit_init (line 74) if (prs==1) || (matlabpool('size') ~= prs)

Error in lme_mass_fit_EMinit (line 69) [Theta1,Re1] = lme_mass_fit_init(X,Zcols,Y,ni,[],prs);

I have defined X, Y etc according to the previous steps available on the wiki. Would be very grateful for any clarification on why this error message keeps coming up.

Thank you very much,

Cathy