error in header when using a function [read_mrtrix_tracks]

a .tck file specified ending points was generated by following code:
connectome2tck $ROItck_file assign_file tck_native_ROI -node {i},${j} -exclusive -keep_self -force -nthreads 10
here, I set node {i} and node {j} same.
then I use function read_mrtrix_tracks in matlab to read this .tck file. It doesn’t show an error, but a message “invalid line in header: ‘count444408’ - ignored” appeared. I don’t know whether this message means somehting wrong in my .tck file, and did this wrong influence my further analysis.