PHP notice coming from the WordPress core?

1) Looks like you are using the Visual Composer Plugin which is a legacy version which has a deprecated function. If you are using old version upgrade your Visual Composer plugin to the latest version which is 5.0.1.

2) Another case might be your are using a theme which might be using Visual Composer as a third-party plugin and has some Visual Composer Addons which is not updated and still uses that add_shortcode_param

Manual Solutions
Find in theme files for add_shortcode_param. If it doesn’t show any then look for the same in your third-party plugins used by your theme and if found then replace those function names with vc_add_shortcode_param

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