Kaltura_Client_Exception thrown

Invalid KS "MDFkYjY0Nzk5MzMzMzA0NjFhOWRmNGMzZGRkY2ZlNjc2OTE1MzljN3wxMDE7OzE0NzI0MjQwMDI7MjsxNDcyMzM3NjAyLjM3MjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"