Kaltura_Client_Exception thrown

Invalid KS "ZDJmZGY1NDY3ZmI2NWUwOTE1MTg1OWUwOTVjYjdmYjYwNTI2M2Q2MXwxMDE7OzE0NzUyMDE3ODU7MjsxNDc1MTE1Mzg1LjE0NzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"