Kaltura_Client_Exception thrown

Invalid KS "NWI1N2QwNThiYTg1MTY5Yjg1MzlhY2M3NjljNzVjMjZlZjZjOGYzNnwxMDE7OzE0NzUxMTU0NTQ7MjsxNDc1MDI5MDU0LjMxMzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"