Kaltura_Client_Exception thrown

Invalid KS "YTY0MjczMTVjNjY4ZGVhNzExMzc0ZDM2M2RjMDU4OGM4Nzg1NWQxZnwxMDE7OzE0NzUwMDU0NzE7MjsxNDc0OTE5MDcxLjI2NzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"