Thanks for the quick reply.
I did flash the SD card jut before, and the IDE did work again with a simple example patch.
Then, I made a new project in the project explorer in the IDE, uploaded my 181MB file, tried to load this, and the error was there again.
-about the PD patch: it features a few minutes of audio and 4 CV lines going out.
what should I do with this?
-about the IDE:
board: bela board
OS: mac os catalina 10.15.7
yes: power led is steady and user leds are blinking
no leds on the Bela cape are blinking
after 30 seconds the drive BELABOOT does show up.