When set name or description in createMedia method with cyrillic(windows-1251) symbols (ыияюъії etc.), function json_encode($post); //line 515 in bc-mapi.php
cut symbols. As result in request name and description = NULL, and response error:
BCMAPIApiError: API error' == Required field name is not set.
My solution :
(line:487 - ..., file:bc-mapi.php )
iconv("windows-1251", "UTF-8", $media['name']);// when it's necessary