Bitly Official WordPress Plug-in Error

Notice: Undefined index: file in /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php on line 95

Notice: Undefined index: file in /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php on line 101

Notice: Undefined index: file in /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php on line 108

Notice: Undefined index: file in /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php on line 113

Fatal error: Uncaught exception ‘BitlyServiceError’ with message ‘INVALID_ACCESS_TOKEN’ in /home/suvichar321/public_html/wp-content/plugins/bitly/lib/BitlyService.php:309 Stack trace: #0 /home/suvichar321/public_html/wp-content/plugins/bitly/lib/BitlyService.php(66): BitlyService->get_bitly_service(‘shorten’, Array) #1 /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php(269): BitlyService->shorten(‘https://suvichar…’, ‘bit.ly’) #2 /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php(244): Bitly->get_bitly_link(‘https://suvichar…’, 1593) #3 /home/suvichar321/public_html/wp-content/plugins/bitly/bitly.php(60): Bitly->get_bitly_link_for_post_id(1593) #4 /home/suvichar321/public_html/wp-content/plugins/jetpack/3rd-party/bitly.php(24): Bitly->og_tags() #5 [internal function]: jetpack_bitly_og_tag(”) #6 /home/suvichar321/public_html/wp-includes/plugin.php(525): call_user_func_array(‘jetpack_bitly_o…’, Array) #7 /home/suvichar321/public_html/wp-includes/general-template.php(2438): do_action(‘wp_head’) #8 /home/suvichar321/pub in /home/suvichar321/public_html/wp-content/plugins/bitly/lib/BitlyService.php on line 309

plz help any solution ?