Cutscene bug

I currently playing the imperium campaign
Im suppose to fight necrons now, but every time i try to start a battle with them
i see that necrons introduction cutscene and when its over its freeze and nothing,
ive tried skipping the cutscene by holding space but space result at the end,
black screen with a little box that says hold space to skip on the bottom right side,
if anyone got any idea how to fix it thanks