Getting error while trying to load tracts

Dear SlicerDMRI forum,

I am very new with Slicer and I have been using other MRI tools such as MRtrix, FreeSurfer, DSI studio etc.

I couldnt find a visualization tool better than Slicer and I am trying to visualize a vascular structure with tractography combined together.

But the problem is, whenever I try to load my tractography (generated with either MRtrix or DSI studio) I keep getting error.

What should I do about this