Error regarding running a GLM analyses

Hi, I am trying to run a GLM analyses, and I get the following errors after running this model: Some more information: demADHD is the primary dataset of demographics (5x36 double matrix), ADHD_GSR (the dependent variable) is a 119x36 double matrix, ADHDage is a 1x36 double matrix, ADHDVIQ is a 1x36 double matrix, and ADHDmeanFD is a 1x36 double matrix.

modelspec = 'ADHD_GSR ~ ADHDage + ADHDVIQ + ADHDmeanFD';  %set up ADHD GSR GLM model
mdl = fitglm(demADHD,modelspec,'Distribution', 'Normal')

When I run the code, I get the following errors:

Error using classreg.regr.FitObject/assignData (line 134)
Predictor and response variables must have the same length.

Error in classreg.regr.TermsRegression/assignData (line 245)
            model = [e-mail](model,X,y,w,asCat,varNames,excl);

Error in GeneralizedLinearModel/assignData (line 507)
            model = [e-mail](model,X,y,w,asCat,dummyCoding,varNames,excl);

Error in GeneralizedLinearModel.fit (line 882)
            model =
            assignData(model,X,y,weights,offset,binomN,asCatVar,dummyCoding,model.Formula.VariableNames,exclude);

Error in fitglm (line 146)
model = GeneralizedLinearModel.fit(X,varargin{:});

How do I go about fixing these errors? The odd thing is that I followed the GLM example in the 'help' page on here, and it is structured in the exact same format - yet mine throws back these errors. But I'm not sure where in my model the mistake is. Thank you!