It says, you don't have sql server installed on your system.
To refresh all your reports daily, you need to set up gateway and if the files are on your system, make sure your system is up & running.
I am here to help you I have already set up a refresh on the report server.
So you have published the report to the report server already is that correct?
1. First, can you go to your report on the web portal.
2. Before you click to open the report, click on the elipsis (three dots) and click Manage. (See image below)
3. You will see data sources in the options. Add in the relevant login details to make a successful connection.
4. Then select the Schedule Refresh option. Click 'New schedule refresh plan'. (See image below)
Give this a go let me know how you get on.