Kaltura_Client_Exception thrown

Invalid KS "NDdlY2I2M2QxMzNmMWE1NzNlMmNlZTYzMTUyN2M5Mzk5MzA0YWQ5YXwxMDE7OzE0OTA0MDkzNzU7MjsxNDkwMzIyOTc1LjUxOTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"