ALFF error message (copyfile)

Hi, I'm new to using the REST toolkit and I'm having some trouble launching ALFF. Basically I input my directory that contains my img/hdr files and select the default parameters for band pass filtering and then select an output directory. When I press do all, this is the error I receive: Build ALFF filtered mask. Wait... ALFF computing. Wait... Exception occured. (MATLAB:UndefinedFunction) Undefined function or variable "idxHighPass_LowCutoff". 179#line, alff, in "/mnt/musk2/home/heydee/REST_V1.4_100426/alff.m" 318#line, btnComputeAlff_Callback, in "/mnt/musk2/home/heydee/REST_V1.4_100426/alff_gui.m" 96#line, gui_mainfcn, in "/mnt/musk2/local/matlab2010b/toolbox/matlab/guide/gui_mainfcn.m" 33#line, alff_gui, in "/mnt/musk2/home/heydee/REST_V1.4_100426/alff_gui.m I looked in the alff.m script and it looked like idxHighPass._LowCutoff was defined, so I'm not sure what's going on.