安装DZZ 云桌面出现的问题

Warning: require(./source/class/class_core.php) [function.require]: failed to open stream: No such file or directory in C:\AppServ\www\upload\dzzadmin.php on line 24

Fatal error: require() [function.require]: Failed opening required './source/class/class_core.php' (include_path='.;C:\php5\pear') in C:\AppServ\www\upload\dzzadmin.php on line 24