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I have just completed the design of the theme and then whole theme got crashed because of this error and its happening at regular bases, does anybody know how to solve it
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Have you contacted the theme’s developer? Seems like they should be able to fix this.
Make that argument optional or use a PHP version less than 8. I think you can also change debugging so it doesn’t print these warnings to the page and only logs them. That might be the best thing if you still need to use this plugin.