Why does my experiment not belong to a project?

I just wanted to sync an online experiment that I worked on all day to pavlovia.org to try something out, but all of a sudden when I click on sync I get this error message:

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Needless to say it was part of project earlier but somehow this information is not there any more. When I use git in the folder, there is no problem and the repository is intact.

When I click on No project and then on Search project I can find my project, add the correct folder to Local root: and then sync but it doesn’t change the fact that when I close this window, I still have no associated project.

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Further investigation shows that there is no remote (test via git remote -v) in the git repo.