Kaltura_Client_Exception thrown

Invalid KS "ZTBiMGI1ZTBkNDFkMGQyOTUyYzI2Yzk3MmEwYzY3NjNmM2M4NDU0MnwxMDE7OzE0NzUyNzQ4ODA7MjsxNDc1MTg4NDgwLjc3MzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"