Kaltura_Client_Exception thrown

Invalid KS "OTFhZjM0ZWNhMGY5MGIyMmQ4OGQyODlmNThmMjlkMTA5MzAxYTNmZHwxMDE7OzE0NzUyNjk5NzE7MjsxNDc1MTgzNTcxLjMwNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"