This is program error speak for “Scenes can’t have the same URL twice”.
It looks like somehow you managed to create an edit that adds a URL that is already present on the scene, which shouldn’t be possible normally via the web UI I believe.
To get around this, I’d suggest redoing the changes in another edit, without the redundant URL addition.
I don’t think that’s right. I have some scenes with the same url and it makes sense in general (e.g. additional content may have the same url as the main content)
I am trying it again. It might be because the scene has a iwantclips link that is recognized as “studio”. I removed it this time and change it to the same link but listed as “iwantclips”
Ah I see, so with the previous edit the scene would have had two identical URLs (with different type). Interesting, seems like a bug that this did not show an error sooner.