Kaltura_Client_Exception thrown

Invalid KS "OWI4ZDRiMjQwZTZiZWYxNjRlOGM1YTcyMDlmMzc5YmNhN2E2N2QwM3wxMDE7OzE1MDA4MDg0MTc7MjsxNTAwNzIyMDE3LjgxNTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"