ERROR:Unrecognized function or variable 'graph_conn_comp_mex'.

Hi, Im trying to run the Demo_script in my mac and this error keeps popping up.

Unrecognized function or variable 'graph_conn_comp_mex'.

Error in graph_connected_comp (line 26)
[l c] = graph_conn_comp_mex(sA);

Error in merge_components (line 65)
[l,c] = graph_connected_comp(sparse(FF3+FF3')); % extract connected components

Error in demo_script_AC (line 98)
[Am,Cm,K_m,merged_ROIs,Pm,Sm] = merge_components(Yr,A_keep,b,C_keep,f,P,S,options);

I've tried a couple of things but nothing seems to fix it. Any ideas how to troubleshoot?