Kaltura_Client_Exception thrown

Invalid KS "OWI0MTUxOTdiYWRkYjZjN2Y1NjllNjllYzg5NWQxYjg0YjFjOWU1MHwxMDE7OzE0OTA0ODgxNjE7MjsxNDkwNDAxNzYxLjgxMzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"