have done the DZ forum development come in and see what's the reason

I have done DZ forum development come in and see what the reason
After the forum upload, after the installation run prompt this:


Warning:require (./source/class/class_core.php) [function.require]: failed to open stream:no such file or directory in E: \bbs.cctcct.com\wwwroot\admin.php on line 18

Fatal Error:require () [function.require]: Failed opening required './source/class/class_core.php ' (include_path= '); C:\php5\pear ') in E:\bbs.cctcct.com\wwwroot\admin.php on line 18


But I'm sure it's all there,

If the "./" is changed to DirName (__file__) This problem is resolved, is it a server permissions problem??




------Solution--------------------
It is possible to change the permissions to try.
------Solution--------------------
The semantics of the./are not as clear as dirname (__file__). or an absolute address. Use absolute address better than relative address

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