upload documents

[viktorsheshenya]

When loading documents pdf error:
Uncaught TypeError: Cannot read property '0' of null

my config:
$(function(){
var csrf_token = $('meta[name=csrf-token]').attr('content');
var csrf_param = $('meta[name=csrf-param]').attr('content');
var params;
if (csrf_param !== undefined && csrf_token !== undefined) {
params = csrf_param + "=" + encodeURIComponent(csrf_token);
}
$('.redactor').redactor(
{ "imageUpload":"/redactor_rails/pictures?" + params,
"fileUpload":"/redactor_rails/documents?" + params,
"imageGetJson":"/redactor_rails/pictures",
"path":"/assets/redactor-rails",
"css":"style.css"}
);
});

my uploadres:
class RedactorRailsDocumentUploader < CarrierWave::Uploader::Base
include RedactorRails::Backend::CarrierWave

storage :fog

storage :file

def store_dir
"system/redactor_assets/documents/#{model.id}"
end

def extension_white_list
RedactorRails.document_file_types
end
end

Help.

[ilyadoroshin]

same here :(