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Hi,
no worry, it’s not an error, it’s only a warning. The problem is that these messages are visible on your website, because those notices are only for developer. This is a security issue, because a hacker can provoke such kind of message and hack your website. Please check if in your hosting panel is a setting for “PHP Errors and Warnings”, and turn it off.
Please note: there is no problem with the theme, it’s only a warning. The theme is working without any problem.