Errors on activation

  • Good day

    Upon activation I get the following errors:
    Notice: Uninitialized string offset: 0 in photoswipe-for-nextgen-gallery/ngg-photoswipe.php on line 95

    Notice: Undefined index: nggphotoswipe_enabled in photoswipe-for-nextgen-gallery/ngg-photoswipe.php on line 73

    Notice: Undefined index: additional_viewers in photoswipe-for-nextgen-gallery/ngg-photoswipe.php on line 77

    I’m using Nextgen Version 1.9.13

    Any suggestions welcome.

    Thank you.

    https://www.ads-software.com/plugins/photoswipe-for-nextgen-gallery/

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