Error: "Exception: Invalid argument: timeZone. Should be of type: String"

[Daniel Gallagher]

Please help, I get this error message when I try to run a merge. Included screenshot of what I can (some information cannot be publicly shared).

[John Castro]

Hello Daniel,

I've received that error before, and I was able to fix it by going to File -> Spreadsheet Settings and selecting a time zone (any time zone should work).

As soon as that time zone was selected, the error stopped appearing.