Kaltura_Client_Exception thrown

Invalid KS "MWM1YzdiM2FlOWY0Yjk4NGUxOTRlNTgzNDEyMGZkNTMxZGE2MDA2ZXwxMDE7OzE0NzUxNjQzNjI7MjsxNDc1MDc3OTYyLjE0MztBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"