Check your naming conventions if all else fails!
Had to login to lend my experience with the same issue.
I was getting “Export Error Unable to create audio renderer.” Which was no help at all for the actual issue, and in-fact had me looking in the work direction for ages.
I had named my project file through finder, not when saving out from premiere, which had a ” / ” in it. I opened and worked on the file no issue but then couldn’t render.
Only when I was trying all these steps did I create a new project and try and save and name it through premiere did it tell me you couldn’t use certain characters.
Good times.