Kaltura_Client_Exception thrown

Invalid KS "MmE4MzUzMGZiNGVmNWE2Y2M5ZTc1NzNjYWNhZGMwNjVhYTVhNWZlM3wxMDE7OzE0NzUwMjkxODE7MjsxNDc0OTQyNzgxLjcxNDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"