Hi Ancabontea,
Please provide a screenshot of the message. Where exactly it appears?
What about FTP? If you don’t know your FTP host, FTP login and FTP pass contact your hosting provider and ask this information.
Once you provide FTP access, I will be able to pass the problem to our technicians and we will do our best to help you.
Lightshot Screenshot tool https://app.prntscr.com/en/index.html makes screenshots and generates links then you can provide links of screenshots here.
Regards