Kaltura_Client_Exception thrown

Invalid KS "ZWM3ZjA0MTE4ZGNkNzc4N2Q0MzgwNTQwODBmYjAyYzc2MjhkNjVmOXwxMDE7OzE0OTA1NzE5MTY7MjsxNDkwNDg1NTE2Ljk1MjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"