Kaltura_Client_Exception thrown

Invalid KS "YmE3NTc0NjgxYzNkNDNiNTNkZjUzODc0YzAxYjg0M2FkNGQ2ZjRkMHwxMDE7OzE0NzUwNzE5MDg7MjsxNDc0OTg1NTA4Ljg1MzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"