Hello Mateusz!
@mateuszgbiorczyk, that issue occured also for me on new WP instance (worth to mention that I am running another WP on the same server in different installation directory and Webp Converter works like a charm there).
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An error occurred while connecting to REST API. Please try again.
1. Webp Converter was the first and only plugin installed.
2. I have enabled debugging in WP.
3. I attach DevConsole screenshots below.
https://ibb.co/mq3R9d9
https://ibb.co/kKWw3YY
thanks in advance for reply.
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This reply was modified 5 years, 10 months ago by onio666.