I am trying to run write_annonation program in MATLAB and getting following error:

>> [v, L, ct] = read_annotation('lh.Yeo2011_7Networks_N1000.annot');
>> ct.table(1:6,1:3) = 1;
>> write_annotation('lh_Yeo2011_DMN',v,L,ct);
Error using fwrite
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in write_annotation (line 55)
count = fwrite(fp, int32(length(label)), 'int');

I would really appreciate any help in resolving this issue.

Thanks !