Kaltura_Client_Exception thrown

Invalid KS "MTlhZDE2ZWNiYjkxYzBjYTZjNjAwYWJhNzBkOTE0NjAyNmE0ZTMyMnwxMDE7OzE0NzUwNzg1MjY7MjsxNDc0OTkyMTI2Ljc1NjtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"