Re: Your profile could not be opened correctly message

I have exactly the same problem as this one. Opera starts up as normal, then displays a blank screen (with an 'Opera' headline if I'm lucky), displays this message and stays there for ever. Task Manager shows 0% CPU. Sometimes it closes down automatically after a long pause.
Suggested solutions always involve changing Opera options, or using Help to find where the profiles may be, but if I can't start Opera, I can't use any of those fixes. I can only use another browser (eg. Edge) to look for things.
I have Uninstalled and Reinstalled 3 times, once finding I had 2 versions simultaneously. My current version, behaving as described above is 124.0.5705.15
If Opera needs a profile, how do I create one?