His defense of Wycliffe was the beginning of it. The culmination was his writings: "De ecclesiâ" and "De sex erroribus", and his final act of defiance of claiming sola scriptura.
What were these six errors in De sex erroribus, that Hus posted on the door of Bethlehem Chapel, and are they errors still? That was heresy and lies?
And Sola Scriptura preceded Martin Luther by a hundred years, in the fourteenth century?
Seriously?