I've been having the same issue for a few days now... I deleted a character to reroll her and now I get this error trying to use a character slot that was just in use.
For me the problem is, I was a gold member ages ago. Since then I made a couple of silver characters. I wanted to reroll one of them so I deleted her. Now when I go to make one in that vacated slot I'm getting a "No Available Character Slot" error... when clearly I had the slots to make a silver character in the first…