Kaltura_Client_Exception thrown

Invalid KS "N2YzNmE3YTBjN2JjMzU0MjliMWU0MGQ2MzIzYzk2NDYxYzZlZjMxM3wxMDE7OzE0NzUyNTcxMjY7MjsxNDc1MTcwNzI2LjM5MjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"