You try to find time using Freebusy on your google calendar and you get an error that reads, "Pardon the interruption, Find a time with Freebusy has trouble loading". You can easily self solve this problem.
This error typically comes up if your browser is set to block 3rd party cookies. When you use FreeBusy inside of Gmail and Google Calendar the browser considers it a 3rd party website (because you are on calendar.google.com and invokes those policies.
If you are using Chrome you can whitelist freebusy.io from that policy.
Here is how to whitelist Freebusy:
Please check if in chrome://settings/cookies you set "Block third-party cookies"
You must then add exceptions that 3rd party cookies be usable in mail.google.com and calendar.google.com in order for FreeBusy integration with Gmail and Google Calendar to work.
There you go!