Your CPAN repo doesn't seem up to date https://metacpan.org/dist/Mojolicious/changes#L567:

8.02  2018-10-01
...
- Added save_to method to Mojo::Message.

[download]

previously.

In reply to Re^7: Using a Fetchrow with LWP by marto
in thread Using a Fetchrow with LWP by justin423

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