Why does presentation in Lightroom Classic not work anymore????

[#1]

I just wanted to make a presentation in LR Classic for my customer, but when I started the presentation the screen stayed black... It's about 50 low res images and some music... I have been busy with it for an hour now and grrrrrr I HATE THIS WASTED OF TIME

[#2]

I just wanted to make a presentation in LR Classic for my customer, but when I started the presentation the screen stayed black... It's about 50 low res images and some music... I have been busy with it for an hour now and grrrrrr I HATE THIS WASTED OF TIME

[#3]

Maybe can Adobe help me out with this? After removing my external harddisks I tried again and I received this message - see picture

Lighroom is using 271 GB for a presentation from 50 low res images and some music??? What is happening here??????