Thanks for the help.
The problem was fixed earlier by the author.
Updated the theme, the error when activating the plugin disappeared.
Find the problem.
The plugin is not compatible with the Pluto theme
https://themeforest.net/item/pluto-clean-personal-wordpress-masonry-blog-theme/7950280
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This reply was modified 6 years ago by paukdriver.
Deactivated all plugins. Not help. The plugin also displays this error.
