Is someone else openning my project elsewhere?

It got this error messag, it seems someone esle i don't know is openning my project:

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You will have opened another session of App Inventor in your browser (e.g. when opening a project from the gallery). Just close down all your App Inventor sessions (tabs/windows) and start again. You should only run one App Inventor session at a time for your account.

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Thanks for the information. I was suspecting that, but made sure that i did not have another session in my browser at the time ( i might have another open about 30 min before the error message).

@Studio_PERCHE' a volte capita anche a me questo errore; quando la sessione del Companion, viene lasciata in standby per troppo tempo...quindi mi tocca riavviare la sessione.