unable to load SAMI subtitle

Problem:

• the subtitle is not shown in Add Subtitle File dialog
• the subtitle is not loaded at all

URL of the original subtitle:

http://natgeo.edgeboss.net/mpx/cc/the-story-of-us-with-morgan-freeman/Story_of_Us_101_HD_Clean_R1_AUTH_1075249219701.sami

verbose output(b26c856b), this the only line that i get printed when i load the file:

[00005570c61da4e0] qt interface warning: unable to load subtitles from 'file:///home/amine/Videos/The%20Story%20of%20Us%20With%20Morgan%20Freeman/The%20March%20of%20Freedom.sami'