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FYI: lat9's fix is now built-in to v1.5.6

Okay, so actually, your issue is NOT "exactly" the same.

The first person posting was getting "Warning: The primary exchange rate server (CURRENCY_SERVER_PRIMARY) failed".

But yours is...

Since the database-upgrade step that's done via zc_install is what handles it, the first guess is that you didn't do that step?

1. Currency updates since v155 are now handled by the server which you've selected in Admin->Configuration->My Store-> primary/secondary Currency servers.
So, if it's not finding...