Error (Warning) in Wp-Admin after save galleries

  • Hello,
    I always get the following error message on the white page after saving the GWTS gallery in the WordPress administration:

    Warning: Undefined array key "gwts_gwl_switcher" in /data/web/virtuals/278040/virtual/www/domains/.../wp-content/plugins/gallery-with-thumbnail-slider/gwts-metabox.php on line 106

Warning: Cannot modify header information - headers already sent by (output started at /data/web/virtuals/278040/virtual/www/domains/.../wp-content/plugins/gallery-with-thumbnail-slider/gwts-metabox.php:106) in /data/web/virtuals/278040/virtual/www/domains/.../wp-includes/pluggable.php on line 1340

Warning: Cannot modify header information - headers already sent by (output started at /data/web/virtuals/278040/virtual/www/domains/.../wp-content/plugins/gallery-with-thumbnail-slider/gwts-metabox.php:106) in /data/web/virtuals/278040/virtual/www/domains/.../wp-includes/pluggable.php on line 1343

    The gallery will be saved, but it is certainly not good that this error persists and causes conflicts in scripts. What could it be?

    I use WordPres version 5.8.2., Neve template version 3.1.0., Sitebuilder – Elementor Pro version 3.5.2.
    PHP version: 8.0.1
    Thank you.

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