• Please change line 509 from
    $item_label = __( ucwords( str_replace( "_", " ", trim($arg) ), "MSP" ), $this->domain );
    to
    $item_label = __( ucwords( str_replace( "_", " ", trim($arg) ) ), $this->domain );
    because it triggers

    PHP Warning: ucwords() expects exactly 1 parameter, 2 given in []/msp.php on line 509

    and it fails to output the labels.

    https://www.ads-software.com/plugins/multisite-posts/

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