Preprocessing error clarification

Hello. New to the forum and to post processing. I downloaded the various files (darks, lights, bias, and flats).
However when I run the preprocessing option, it stops because:
16:03:35: Processing all images in the sequence (200)
16:03:35: Stacking result will be stored as a 32-bit image
16:03:35: Stacking error: input images have different sizes
16:03:35: Opening image 1 failed
16:03:35: Stacking failed.
16:03:35: Execution time: 0.56 ms.
16:03:35: Setting CWD (Current Working Directory) to ‘/Users/tg/Documents/Siril’
16:03:35: Script execution failed

This is always the case as it starts with Bias files (which is a combination of jpeg and fit files.
Can someone help me understand what I need to do to my files to make them work?
Currently running on MAC OS Monterrey 12.4

This is the error.
Why using jpeg? It is already debayerd images that should never be used at the preprocessing stage.
You should have a look to our tutorials first.

Cheers.

Thanks for the clarification. I eliminated all the jpegs and left the .fit files. However I am still getting an error (see below). Is it due to the amount of files I have for Biases as compared to the other folders?Running command: requires
16:39:05: # Convert Bias Frames to .fit files
16:39:05: Running command: cd
16:39:05: Setting CWD (Current Working Directory) to ‘/Users/tg/Documents/Siril/biases’
16:39:05: Running command: convert
16:39:05: Convert: processing 100 FITS files…
16:39:05: Conversion succeeded, 100 file(s) created for 100 input file(s) (100 image(s) converted, 0 failed)
16:39:05: Running command: cd
16:39:05: Setting CWD (Current Working Directory) to ‘/Users/tg/Documents/Siril/process’
16:39:05: # Stack Bias Frames to bias_stacked.fit
16:39:05: Running command: stack
16:39:05: Stacking sequence bias_
16:39:05: Processing all images in the sequence (200)
16:39:05: Stacking result will be stored as a 32-bit image
16:39:05: Stacking error: input images have different sizes
16:39:05: Opening image 100 failed
16:39:05: Stacking failed.
16:39:05: Execution time: 11.92 ms.
16:39:05: Setting CWD (Current Working Directory) to ‘/Users/tg/Documents/Siril’
16:39:05: Script execution failed.

Hello, you should remove the process directory when you make changes in the input files or script, there are files that don’t belong here now:

Stacking error: input images have different sizes