Kaltura_Client_Exception thrown

Invalid KS "ZDMwOTE5MGE3NDBhYjI4MDg2YTY3YjMyNDA3OWFmNDU5MzQzMmQ4OHwxMDE7OzE0OTg3ODkxNjA7MjsxNDk4NzAyNzYwLjc0NTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"