How to fix Fatal error: Cannot redeclare get_cli_args() in class-wp-importer.php

Question

I'm getting the following error:

Fatal error: Cannot redeclare get_cli_args() (previously declared in C:\xampp\htdocs\wordpress\wp-admin\includes\class-wp-importer.php:276) in C:\xampp\htdocs\wordpress\wp-admin\includes\class-wp-importer.php on line 276

function get_cli_args( $param, $required = false ) {
    $args = $_SERVER['argv'];
    if ( ! is_array( $args ) ) {
        $args = array();
    }
    // ...
}

How do I fix it?

Answer 1

Are you somehow including wp-admin\includes\class-wp-importer.php using include or require? That may cause the error of get_cli_args() function declared twice.

If that is the case, then you better use include_once or require_once.

Also, perhaps you should test your installation by disabling all the plugins and any custom theme. Then activate the theme and test WordPress. Then activate one plugin at a time and test each time to see if the error appears. This will show if this error is caused by any plugin or theme.