Kaltura_Client_Exception thrown

Invalid KS "ZWMyYmJjN2Y5MTBiZGM2YTQxYTkyOGJiMGFhYWQ4NDkxMWY2NDhkYXwxMDE7OzE0OTU5MTI4NTU7MjsxNDk1ODI2NDU1LjQ3NDtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"