Kaltura_Client_Exception thrown

Invalid KS "NmE1Y2M1ZWZlNmRkMmE4YjA5NmYxMWViY2IzOGQxYjgwZjYzYjgwMnwxMDE7OzE0NzUwOTAwNjU7MjsxNDc1MDAzNjY1Ljc0NDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"