Warning: Undefined array key "pro_widgets" in E:\xammp\htdocs\vc\wp-content\plugins\elementor\includes\api.php on line 160
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Well this seems like a warning beacuse of elementor plugin. To get rid of it initially you can turn your debug off. https://wordpress.org/support/article/debugging-in-wordpress/ Also, what PHP version are you at ? And have you downloaded it from the legit sources ? – bhanu Jul 03 '21 at 05:08
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I'd guess its using a pro module for an install of Elementor that isn't registered as pro – Kinglish Jul 03 '21 at 05:25
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See https://stackoverflow.com/a/70964887/612253 for a temporary fix. – Highly Irregular Feb 03 '22 at 01:26
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It's saying that on line 160 of the file at that path, there is a statement which is looking for a key called "pro_widgets" in some array, but that key has not been defined, so it can't get the value.

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This is correct, but as this is a plugin(elementor), the author should not edit it any core files of it, in my opinion. – bhanu Jul 03 '21 at 05:09
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