Unexpected issue. There seems to be an issue with your Google sheet access. Please check your Google Sheet Id/URL/access permissions.
1. Please make sure the Google sheet has access to the Gmail Id you used to login to Siteoly.
2. Sometimes you may be logged into multiple Google accounts in browser. Please check the Google sheet has correct access to the id you used to signin to Siteoly.
If the issue still persists, please contact support