Fix script error description
Fix script error description

Summary: As per title

Test Plan: make check

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, deadalnix, Mengerian

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, deadalnix, Mengerian

Subscribers: Mengerian, teamcity, schancel

Differential Revision: https://reviews.bitcoinabc.org/D2505

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