Error importing a Google calendar ‘Failed to import events: Could not upload your events because you do not have sufficient access on the target calendar..’

Whilst I was importing my last calendar into my main Google calendar I received this error despite being the owner of both calendars!

A quick search showed that I’m not the only one to have faced this issue. The resolution that worked for me was to open your exported .ics calendar file in a text editor such as Notepad (best to take a back up copy first) and select Edit > Replace

In the Find what: field select UID: and in the Replace with: field type UID:X (basically it can be X or replace X with any alpha-numeric character (a-z,0-9)

Save the .ics file and redo the calendar import. Now it should import without error.