Critical error

First testing this plugin (wp 6.4, 2023 theme with edits)
With TripAdvisor Business URL:

https://www.tripadvisor.com/Attraction_Review-g4555835-d13235033-Reviews-4_DRITL_Virtualni_Muzej_Rudarstva-Trbovlje_Styria_Region.html

I get the following critical error after pressing Save&Download button:

Warning: file_get_contents(https://www.tripadvisor.com/Attraction_Review-g4555835-d13235033-Reviews-4_DRITL_Virtualni_Muzej_Rudarstva-Trbovlje_Styria_Region.html): failed to open stream: HTTP request failed! in /home/trbovlje/test.trbovlje.org/wp23/wp-content/plugins/wp-tripadvisor-review-slider/admin/class-wp-tripadvisor-review-slider-admin.php on line 739

Fatal error: Uncaught Error: Call to a member function find() on bool in /home/trbovlje/test.trbovlje.org/wp23/wp-content/plugins/wp-tripadvisor-review-slider/admin/class-wp-tripadvisor-review-slider-admin.php:745 Stack trace: #0 /home/trbovlje/test.trbovlje.org/wp23/wp-content/plugins/wp-tripadvisor-review-slider/admin/class-wp-tripadvisor-review-slider-admin.php(700): WP_TripAdvisor_Review_Admin->wptripadvisor_download_tripadvisor_master() #1 /home/trbovlje/test.trbovlje.org/wp23/wp-includes/class-wp-hook.php(324): WP_TripAdvisor_Review_Admin->wptripadvisor_download_tripadvisor(”) #2 /home/trbovlje/test.trbovlje.org/wp23/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #3 /home/trbovlje/test.trbovlje.org/wp23/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home/trbovlje/test.trbovlje.org/wp23/wp-settings.php(506): do_action(‘plugins_loaded’) #5 /home/trbovlje/test.trbovlje.org/wp23/wp-config.php(96): require_once(‘/home/trbovlje/…’) #6 /home/trbovlje/test.trbovlje.org/wp23/wp-load.ph in /home/trbovlje/test.trbovlje.org/wp23/wp-content/plugins/wp-tripadvisor-review-slider/admin/class-wp-tripadvisor-review-slider-admin.php on line 745

Notice: Funkcija is_embed je bila klicana nepravilno. Pogojne poizvedbene oznake ne delujejo, preden je izvedena poizvedba. Pred tem vedno vrnejo false. Za ve? podrobnosti si oglejte razhro??evanje v WordPressu. (To sporo?ilo je bilo dodano v izdaji 3.1.0.) in /home/trbovlje/test.trbovlje.org/wp23/wp-includes/functions.php on line 6031

Notice: Funkcija is_search je bila klicana nepravilno. Pogojne poizvedbene oznake ne delujejo, preden je izvedena poizvedba. Pred tem vedno vrnejo false. Za ve? podrobnosti si oglejte razhro??evanje v WordPressu. (To sporo?ilo je bilo dodano v izdaji 3.1.0.) in /home/trbovlje/test.trbovlje.org/wp23/wp-includes/functions.php on line 6031

Na strani je pri?lo do kriti?ne napake. Za ve? podrobnosti poglejte v e-po?tni nabiralnik administratorja spleti??a.

Nau?ite se ve? o odpravljanju napak v WordPressu.

Any idea what to do about it?