so this thing ALWAYS shows up, i have NO idea why, i exported another c3p of the project ONCE
please help because this project really means a lot to me and i've been working a lot on it for the last year
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all other projects work
here's another image, this is what happens when i try and open the project
I don't know if this is the same problem you are having. But something similar happened to me and it was a missing addon/wrong addon version.
reinstalled all the addons i had and none of them worked
I'm afraid that error message means the project file has become corrupt. It's possible some kind of software or hardware fault occurred. This type of thing is why it's essential to keep regular backups - Construct can make backups for you automatically, but you must enable them in Settings first. You can also try recovering the project with my specially-designed zip recovery tool, but I'm afraid there's no guarantee it will still produce an openable project afterwards - typically it can recover some but not all the project files.