How to get Fuzzy C-Means working?

Hello, I have the following code and my graph is entirely blue and sometimes it's just blank because the "iteration count" comes out as Nan. Is it because of my file type? How can I fix this?

fid=fopen('all_classes_withns_dmjd.txt');
myimport=textscan(fid,'%s %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f','Headerlines',1);
fclose(fid);
mydata=cell2mat(myimport(:,2:29));
data = mydata(1:1016,:);
[center,U,obj_fcn] = fcm(data, 2);
plot(data(:,1), data(:,2),'o');
maxU = max(U);
index1 = find(U(1,:) == maxU);
index2 = find(U(2, :) == maxU);
line(data(index1,1),data(index1, 2),'linestyle','none','marker','*','color','g');
line(data(index2,1),data(index2, 2),'linestyle','none','marker','*','color','r');

Thanks in advance!