Parameter $1 of message "Mwe-upwiz-api-warning-exists" has wrong format:
"There is [/wiki/File:Ballonfahrt_%C3%BCber_K%C3%B6ln_-_Blick_Richtung_Vingst_und_H%C3%B6henberg%2C_Rangierbahnhof_K%C3%B6ln-Kalk_Nord-RS-4168.jpg another file] already on the wiki with the same filename."
Full URL is needed here.
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Severity: normal