If you are seeing this error, it means that you have logged in to the wrong author account and email address. You will need to sign out and sign back in with the correct email address associated with the author account that owns that story.
If you are signed in to multiple Google accounts at the same time, sometimes the system will automatically choose your main Google account and will not let you select a different Google account when signing in, which can cause this error.
If you are unable to choose the correct Google account at sign in, please sign out of all Google accounts on your device. Then you should be able to select the correct Google account at sign in.