Error using horzcat - Seed-based Functional Connectivity

Hello,

I just started to do my first resting-state analysis using the REST/DPARSF toolbox. I want to do a seed based functional connectivity analysis. But unfortunatley the an error occurs after I've extracted the ROI time course (for details see below). I am using a Mac OS X (Version 10.8.2), Matlab 2012b, SPM8, REST (Version 1.8), DPARSF 2.1. 
Any suggestions?

Extracting ROI time courses over, elapsed time: 10.01 seconds.

Error using horzcat
Dimensions of matrices being concatenated are not consistent.
 
Error in DPARSF_run (line 1209)
            Covariables=[Covariables,theROITimeCourses];
 
Error in DPARSF>pushbuttonRun_Callback (line 976)
    [Error]=DPARSF_run(handles.Cfg);
 
Error in gui_mainfcn (line 96)
        feval(varargin{:});
 
Error in DPARSF (line 43)
    gui_mainfcn(gui_State, varargin{:});
 
Error while evaluating uicontrol Callback