Error while doing seed-to-voxel analysis

Hello, I am doing a seed-to-voxel analysis for 2 seeds and I am getting the following error message at the 2nd level analysis. Can someone let me know what I need to do to correct this error? Thank you so much!

[i]Cell contents reference from a non-cell array object.[/i]

[i]Error in conn_process (line 3888)[/i]
[i]if isdir(fullfile(filepathresults2,foldername_back{nfolderbak})), foldername=foldername_back{nfolderbak}; break; end % backwards-compatibility with existing results[/i]
[i]Error in conn_process (line 52)[/i]
[i]case 'results_voxel', [varargout{1:nargout}]=conn_process(16,varargin{:});[/i]
[i]Error in conn (line 8594)[/i]
[i]conn_process('results_voxel','readsingle','seed-to-voxel');[/i]
[i]Error in conn_menumanager (line 120)[/i]
[i]feval(CONN_MM.MENU{n0}.callback{n1}{1},CONN_MM.MENU{n0}.callback{n1}{2:end});[/i]