Kaltura_Client_Exception thrown

Invalid KS "Nzg5MTFhZDBiZGZkMTExMzIzZjg4YzNjMzE0ODBkNGZiNGNkMmYxMXwxMDE7OzE0NzU0MjkyODE7MjsxNDc1MzQyODgxLjA1MDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"