Kaltura_Client_Exception thrown

Invalid KS "ZGIxMzZmMjRlNTM0YWE4MTBlYjc3NzE4YTBiNzdhYmI2MzRkYzIwMXwxMDE7OzE0OTU3MDEwMjY7MjsxNDk1NjE0NjI2LjUyNTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"