Kaltura_Client_Exception thrown

Invalid KS "MjZiNDZmMjIxNGE5YmE5Y2NkMjViYzhjNGEyYjY5MDYyMzYxMjljNnwxMDE7OzE0NzQ5MzYxMjU7MjsxNDc0ODQ5NzI1LjcxOTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"