Kaltura_Client_Exception thrown

Invalid KS "NjA1ZWUyMjViMGE4ZWE2ZDFmNTUzYjg5NjU2NGNkYTIzNmVjNzVlMnwxMDE7OzE0ODUzNjU5OTE7MjsxNDg1Mjc5NTkxLjE1MTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"