Hi, I am Pro user, trying to sync my doit.im account with Google calendar.

I opened doit.im in web-browser (Google Chrome), went to Preferences -> Account Info -> and pressed "Link to Google Calendar" button in "Two-way Sync between Doit.im and Google Cal" section.

In the next window I selected my Google account and pressed next button. The error message occurs:
"This app is blocked
This app tried to access sensitive info in your Google Account. To keep your account safe, Google blocked this access."

Please kindly advise, how to solve this?