Avishan

Intro 4 -> Binomische Formeln and in 4 Binomische Formel -> Inhalte mit Erklärungen
the video or the preview pictures are too large before starting the video (then it is alright) so probably there is a wrong size given while including the preview picture

Probably the error is here: 4_kv_termegleichungen.tex and here are the errors with all three videos: 4_lv_termegleichungen_binomischeformeln.tex
That are the videos which are raising the error: 04_lv_ersteBinoFormel.png and 04_lv_zweiteBinoFormel.png and 04_lv_dritteBinoFormel.png
You should find the inclusion in the tex file.

input -> files_vemint -> video -> 04_lv_ersteBinoFormel and 04_lv_zweiteBinoFormel and 04_lv_dritteBinoFormel

You can see the error here: https://moodle.math.uni-paderborn.de/course/view.php?id=20
and here: https://moodle.math.uni-paderborn.de/course/view.php?id=21&section=1#tabs-tree-start