New Error uploading mod to Steam - Invalid Parameter

I’ve started getting this error when trying to update one of my mods.

[2016-10-08 06:42:47] [AppID 346110] Updated finished for workshop item 698238991 : Invalid Parameter

And helpful clues?

Does the name have any symbols in it?

No special characters, not too long, triple checked the image is still there…

But then I tried with my second steam account and it uploaded with no problem.

have you put anything on the notes? I think all fields need something in them.