What could be the reason for errors in uploading photos and videos to a VK group?

Question

PHP

Hello!
There are scripts that take content from the site and upload it to the VKontakte group. The first script creates a photo album, and uploads certain photos there, followed by posting the album to the wall, the second script downloads the video from the site and posts it to the wall. Everything worked great until today. Today, when I try to upload a photo album, I get an error:

Array ( [error] => Array ( [error_code] => 118 [error_msg] => Invalid server [request_params] => Array ( [0] => Array ( [key] => oauth [value] => 1 ) [1] => Array ( [key] => method [value] => photos.save ) [2] => Array ( [key] => group_id [value] => ИД_ГРУППЫ) [3] => Array ( [key] => caption [value] => ОПИСАНИЕ ) [4] => Array ( [key] => album_id [value] => ИД_АЛЬБОМА ) ) ) )

When I try to upload a video, I get the following error:

Array ( [error] => Array ( [error_code] => 100 [error_msg] => One of the parameters specified was missing or invalid: photo is undefined [request_params] => Array ( [0] => Array ( [key] => oauth [value] => 1 ) [1] => Array ( [key] => method [value] => photos.saveWallPhoto ) [2] => Array ( [key] => group_id [value] => ИД_АЛЬБОМА ) ) ) )

The accounts used to download videos are working, there were no such problems before. Please tell me what could be the reason?
Thank you in advance!