Assertion `valid_pixel(p1) && valid_pixel(p2) && valid_pixel(p3)' failed. Aborted

[R-285]

Hi. Thank you for your great work. It's really interesting and helpful.
I am trying to run your program with your test data and I am getting the following error:
num_views:219
982349 total edges.
371352 faces have not been seen by a view.
Saving model... done.
loading face info ...
G2LTex: tex/texture_view.cpp:195: void tex::TextureView::get_face_info(const Vec3f&, const Vec3f&, const Vec3f&, tex::FaceProjectionInfo*, const tex::Settings&) const: Assertion `valid_pixel(p1) && valid_pixel (p2) && valid_pixel(p3)' failed.
Aborted
What should I do to make everything work smoothly?