Kaltura_Client_Exception thrown

Invalid KS "Y2M1OGVkZmJkNzZhMTcxY2JjOWIxMGI0NWE0MTJkNTYyMWNmMjY5Y3wxMDE7OzE0NzUxNTg3NDA7MjsxNDc1MDcyMzQwLjI1OTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"