Midi doesnt show up

Hi, over the last years ive made many videos with see music. Lately i am using ableton live 11 lite to record the midi of my epiano. With that i can make the midi and the the wave file. it always worked well. But now everytime when i am importing the midi file that ive saved, i cant start the video. There is time left and i can also jump to different points on the time bar, but it doesnt start the video. No tiles are falling down and my video file (that of my hands) doesnt show up. when im selecting the etude midi files, that always have been there, everything works fine and the video of my hands pops up again. i dont know what to do please help me its really frustrating :‘(