Unknown error
Those errors indicate that something went wrong during the process. This could occurs for many reason, most of the time it's because of a unknown compatibility.
The error modal
If you AutoCut detect that there is not enough free space during process, you will see the following error modal:

How to fix it
There is no current way to fix this error.
If you encounter this problem frequently, please contact us with your file so we can add support for it.