Kaltura_Client_Exception thrown

Invalid KS "YWIzZTYwZGE1ZTQxMDMzODc1MDExMTcxMTY5NWI1OWFmYWM0NDAxZXwxMDE7OzE0NzQ4NjkwNDA7MjsxNDc0NzgyNjQwLjI3NjtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"