Thank you very much for your reply. I found an old thread stating the same issue I have (Unable to change status to 'Running' - #9 by sophie_bouton), and the solution proposed there worked for me.
Basically, this issue occurs because I have an existing lib repository in my project at the time I change the status of my experiment. To resolve the issue I just need to change the name of that lib repository.
Thanks!
Kind regards,
Qianchen