Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /wp-content/plugins/code-snippets-pro/php/front-end/elementor/class-source-widget.php on line 266

Warning: Array to string conversion in /wp-includes/kses.php on line 1805

Fatal error: Uncaught TypeError: str_contains(): Argument #1 ($haystack) must be of type string, array given in /wp-includes/blocks.php:1687

I am making a portal using WordPress. I have some custom post types client. The first post I create and click on its Elementor post page, opens up correctly no errors there. As soon as I create a second for some reason I get this error. Can anybody help me understand what that is?