As with the user in this topic, I can offer you to try to repair your file, if Krita keeps saying it can not be parsed, no matter which location you save it to. With the issue, you describe, the trick with an empty canvas won’t work, you can spare your time trying it with your file.
I’m sending a PM to you too, but because it is late, I’ll have to go to bed now and will be back tomorrow.
Hello @Nora_Kekko, and welcome to the forum!