File was not included due to access errors, but no log of it

Hello,

since this morning my backup on a linux machine is reporting constantly the following message:

Backup for / at revision 10163 completed
1 file was not included due to access errors

I enabled verbose and debug mode but no output is given for the file that’s not included.

How can I find which file it is?

Thanks

Can you find any messages like this in the log?

WARN OPEN_FAILURE Failed to open file for reading:

I cannot find. I cannot find any message like WARN, ERROR, open, etcù

Anyway now the error is gone