Interoberability Failure

What does this mean and how can I fix it?

Uhm… it’s hard to understand what this means: can you try spend a bit more time to explain what you’re doing, where, when does the error message appear, what product you’re using, what have you tried to diagnose it, what were you expecting to see, which URL shows it… logs, screenshots… anything, or we can’t help you.

So i am trying to use cyberduck to upload my website I do believe