Kaltura_Client_Exception thrown

Invalid KS "NzYxYzg4ZDA5ZWNkMGVkZjI0ZWJmM2Q2MjNiMmU2NzJjNjkxNmRlNXwxMDE7OzE0OTMwMjc4Nzg7MjsxNDkyOTQxNDc4LjE0ODQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"