RSS display error

One of these days i wanted to get the feed from one of my blogs to another but when i placed the RSS plugin to the sidebar and tried to connect to my other blog it said Operation Timeout. Then i went to that blog RSS and when i typed https://www.blogname.com/rss i got the following error: This XML file does not appear to have any style information associated with it. The document tree is shown below.

Anyone has any idea how to fix this? I want to mention that RSS worked first time when i checked the blog but never had the chance to do it again
because i didn’t need it. Now i do and it doesn’t work ?? Any advice please ?

Thanks,
George