Kaltura_Client_Exception thrown

Invalid KS "ZWRlZDQyNjVkNmExMjVlMTY1MmNjNzlhZjQ5NTgxMTk0MzI1OWQ3N3wxMDE7OzE0OTM0NTM1MjY7MjsxNDkzMzY3MTI2Ljc1ODU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"