File Extension Error

I have a simple form with name and a couple of fields and then the ADV Uploader in it too when I try to add a file it says
File Extension Error even when I pick a file that is in the filter list. Here are my setting:

{“last_tab”:””,”auto_upload_status”:”1″,”duplicates_status”:”1″,”drag_drop_status”:”0″,”filter_file_type”:”kth, pdf, doc, docx, xls, csv, txt, rtf, html, zip, mp3, wma, mpg, avi, jpg, jpeg, png, gif, mp4, mp3, ppt, pub, m4a, mov, vts, vob, m4v, m2ts, dvr, 264, mp4, bup, mts, psd, png, ai, eps, jpg, jpeg, MOV, mpeg-4, key”,”max_files”:”10″,”max_file_size”:”1726″,”ui_select”:”jquery-ui”,”list_view”:”1″,”thumb_view”:”0″,”ui_view”:”list”,”browse_button_dom_id”:”pickfiles”,”chunk_status”:”1″,”chunk_size”:”5″,”runtimes”:{“html5″:”HTML5″,”flash”:”Flash”,”silverlight”:”Silverlight”,”html4″:”HTML4″},”video_plugin_status”:”0″,”save_video_file_on_server”:”0″,”confirmation_email”:””,”user_submit_text”:”Uploading files please wait”,”api_select”:”youtube”,”youtube_api_key_text”:”YouTube App Key”,”youtube_username_text”:”YouTube Username”,”youtube_password_text”:”YouTube Password”,”bc_server”:”upload.brightcove.com”,”bc_username”:”[email protected]”,”bc_password”:”FTP Password”,”bc_publisher_id”:”Publisher ID”,”bc_preparer”:”E.G. MyApp”,”rename_file_status”:”1″,”REDUX_last_saved”:1410184971,”REDUX_imported”:false,”info_success”:””,”redux-backup”:”1″}

https://www.ads-software.com/plugins/gravity-forms-advanced-file-uploader/